searchable: standardize the <field>_matches operator for text fields.

Standardize it so that all fields of type `text` are searchable with
`search[<field>_matches]`.

Before, the `<field>_matches` param was handled manually and some fields
were left out or handled inconsistently. Now it applies to all columns
of type `text`.

This does a full-text search on the field, so for example, searching
`/artist_commentaries?search[translated_description_matches]=smiling`
will match translated commentaries containing either the word "smiling",
"smiles", "smiled", or "smile".

Note that this only applies to columns defined as type `text`, not to
columns defined as `character varying`. The difference is that `text` is
used for fields containing free-form natural language, such as comments,
notes, forum posts, wiki pages, pool descriptions, etc, while `character
varying` is used for short strings not containing free-form language,
such as tag names, wiki page titles, urls, status fields, etc.

API changes:

* Add the `search[original_title_matches]`, `search[original_description_matches]`,
  `search[translated_title_matches]`, `search[translated_description_matches]` params
  to /artist_commentaries and /artist_commentary_versions.
* Remove the `search[name_matches]` and `search[group_name_matches]` params from /artist_versions.
* Remove the `search[title_matches]` param from /wiki_page_versions.
* Change the `search[name_matches]` param on /pools, /favorite_groups, and /pool_versions
  to do a full-text search instead of a substring match.

app/models/note_version.rb

@@ -7,7 +7,6 @@ class NoteVersion < ApplicationRecord
 
   def self.search(params)
     q = search_attributes(params, :id, :created_at, :updated_at, :is_active, :x, :y, :width, :height, :body, :version, :updater, :note, :post)
-    q = q.text_attribute_matches(:body, params[:body_matches])
 
     q.apply_default_order(params)
   end