Revamp post filtering system (#18058)

* Add model for custom filter keywords

* Use CustomFilterKeyword internally

Does not change the API

* Fix /filters/edit and /filters/new

* Add migration tests

* Remove whole_word column from custom_filters (covered by custom_filter_keywords)

* Redesign /filters

Instead of a list, present a card that displays more information and handles
multiple keywords per filter.

* Redesign /filters/new and /filters/edit to add and remove keywords

This adds a new gem dependency: cocoon, as well as a npm dependency:
cocoon-js-vanilla. Those are used to easily populate and remove form fields
from the user interface when manipulating multiple keyword filters at once.

* Add /api/v2/filters to edit filter with multiple keywords

Entities:
- `Filter`: `id`, `title`, `filter_action` (either `hide` or `warn`), `context`
  `keywords`
- `FilterKeyword`: `id`, `keyword`, `whole_word`

API endpoits:
- `GET /api/v2/filters` to list filters (including keywords)
- `POST /api/v2/filters` to create a new filter
  `keywords_attributes` can also be passed to create keywords in one request
- `GET /api/v2/filters/:id` to read a particular filter
- `PUT /api/v2/filters/:id` to update a new filter
  `keywords_attributes` can also be passed to edit, delete or add keywords in
   one request
- `DELETE /api/v2/filters/:id` to delete a particular filter
- `GET /api/v2/filters/:id/keywords` to list keywords for a filter
- `POST /api/v2/filters/:filter_id/keywords/:id` to add a new keyword to a
   filter
- `GET /api/v2/filter_keywords/:id` to read a particular keyword
- `PUT /api/v2/filter_keywords/:id` to edit a particular keyword
- `DELETE /api/v2/filter_keywords/:id` to delete a particular keyword

* Change from `irreversible` boolean to `action` enum

* Remove irrelevent `irreversible_must_be_within_context` check

* Fix /filters/new and /filters/edit with update for filter_action

* Fix Rubocop/Codeclimate complaining about task names

* Refactor FeedManager#phrase_filtered?

This moves regexp building and filter caching to the `CustomFilter` class.

This does not change the functional behavior yet, but this changes how the
cache is built, doing per-custom_filter regexps so that filters can be matched
independently, while still offering caching.

* Perform server-side filtering and output result in REST API

* Fix numerous filters_changed events being sent when editing multiple keywords at once

* Add some tests

* Use the new API in the WebUI

- use client-side logic for filters we have fetched rules for.
  This is so that filter changes can be retroactively applied without
  reloading the UI.
- use server-side logic for filters we haven't fetched rules for yet
  (e.g. network error, or initial timeline loading)

* Minor optimizations and refactoring

* Perform server-side filtering on the streaming server

* Change the wording of filter action labels

* Fix issues pointed out by linter

* Change design of “Show anyway” link in accordence to review comments

* Drop “irreversible” filtering behavior

* Move /api/v2/filter_keywords to /api/v1/filters/keywords

* Rename `filter_results` attribute to `filtered`

* Rename REST::LegacyFilterSerializer to REST::V1::FilterSerializer

* Fix systemChannelId value in streaming server

* Simplify code by removing client-side filtering code

The simplifcation comes at a cost though: filters aren't retroactively
applied anymore.

app/serializers/rest/filter_keyword_serializer.rb

@@ -0,0 +1,9 @@
+# frozen_string_literal: true
+
+class REST::FilterKeywordSerializer < ActiveModel::Serializer
+  attributes :id, :keyword, :whole_word
+
+  def id
+    object.id.to_s
+  end
+end

app/serializers/rest/filter_result_serializer.rb

@@ -0,0 +1,6 @@
+# frozen_string_literal: true
+
+class REST::FilterResultSerializer < ActiveModel::Serializer
+  belongs_to :filter, serializer: REST::FilterSerializer
+  has_many :keyword_matches
+end

app/serializers/rest/filter_serializer.rb

@@ -1,10 +1,14 @@
 # frozen_string_literal: true
 
 class REST::FilterSerializer < ActiveModel::Serializer
-  attributes :id, :phrase, :context, :whole_word, :expires_at,
-             :irreversible
+  attributes :id, :title, :context, :expires_at, :filter_action
+  has_many :keywords, serializer: REST::FilterKeywordSerializer, if: :rules_requested?
 
   def id
     object.id.to_s
   end
+
+  def rules_requested?
+    instance_options[:rules_requested]
+  end
 end

app/serializers/rest/status_serializer.rb

@@ -13,6 +13,7 @@ class REST::StatusSerializer < ActiveModel::Serializer
   attribute :muted, if: :current_user?
   attribute :bookmarked, if: :current_user?
   attribute :pinned, if: :pinnable?
+  has_many :filtered, serializer: REST::FilterResultSerializer, if: :current_user?
 
   attribute :content, unless: :source_requested?
   attribute :text, if: :source_requested?
@@ -120,6 +121,14 @@ class REST::StatusSerializer < ActiveModel::Serializer
     end
   end
 
+  def filtered
+    if instance_options && instance_options[:relationships]
+      instance_options[:relationships].filters_map[object.id] || []
+    else
+      current_user.account.status_matches_filters(object)
+    end
+  end
+
   def pinnable?
     current_user? &&
       current_user.account_id == object.account_id &&

app/serializers/rest/v1/filter_serializer.rb

@@ -0,0 +1,26 @@
+# frozen_string_literal: true
+
+class REST::V1::FilterSerializer < ActiveModel::Serializer
+  attributes :id, :phrase, :context, :whole_word, :expires_at,
+             :irreversible
+
+  delegate :context, :expires_at, to: :custom_filter
+
+  def id
+    object.id.to_s
+  end
+
+  def phrase
+    object.keyword
+  end
+
+  def irreversible
+    custom_filter.irreversible?
+  end
+
+  private
+
+  def custom_filter
+    object.custom_filter
+  end
+end