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/javascript/mastodon/components/status.js

@@ -116,6 +116,7 @@ class Status extends ImmutablePureComponent {
   state = {
     showMedia: defaultMediaVisibility(this.props.status),
     statusId: undefined,
+    forceFilter: undefined,
   };
 
   static getDerivedStateFromProps(nextProps, prevState) {
@@ -277,6 +278,15 @@ class Status extends ImmutablePureComponent {
     this.handleToggleMediaVisibility();
   }
 
+  handleUnfilterClick = e => {
+    this.setState({ forceFilter: false });
+    e.preventDefault();
+  }
+
+  handleFilterClick = () => {
+    this.setState({ forceFilter: true });
+  }
+
   _properStatus () {
     const { status } = this.props;
 
@@ -328,7 +338,8 @@ class Status extends ImmutablePureComponent {
       );
     }
 
-    if (status.get('filtered') || status.getIn(['reblog', 'filtered'])) {
+    const matchedFilters = status.get('filtered') || status.getIn(['reblog', 'filtered']);
+    if (this.state.forceFilter === undefined ? matchedFilters : this.state.forceFilter) {
       const minHandlers = this.props.muted ? {} : {
         moveUp: this.handleHotkeyMoveUp,
         moveDown: this.handleHotkeyMoveDown,
@@ -337,7 +348,11 @@ class Status extends ImmutablePureComponent {
       return (
         <HotKeys handlers={minHandlers}>
           <div className='status__wrapper status__wrapper--filtered focusable' tabIndex='0' ref={this.handleRef}>
-            <FormattedMessage id='status.filtered' defaultMessage='Filtered' />
+            <FormattedMessage id='status.filtered' defaultMessage='Filtered' />: {matchedFilters.join(', ')}.
+            {' '}
+            <button className='status__wrapper--filtered__button' onClick={this.handleUnfilterClick}>
+              <FormattedMessage id='status.show_filter_reason' defaultMessage='Show anyway' />
+            </button>
           </div>
         </HotKeys>
       );
@@ -496,7 +511,7 @@ class Status extends ImmutablePureComponent {
 
             {media}
 
-            <StatusActionBar scrollKey={scrollKey} status={status} account={account} {...other} />
+            <StatusActionBar scrollKey={scrollKey} status={status} account={account} onFilter={matchedFilters && this.handleFilterClick} {...other} />
           </div>
         </div>
       </HotKeys>