- Add the configuration option for annotating templates with file names to the generated app.
- Add `annotate_rendered_view_with_filenames` option to configuring guide.

* Use app:binstub:yarn in Action Text install generator

Also cleanup Action Text Changelog.

As a developer, when looking at a page in my web browser, it's sometimes
difficult to figure out which template(s) are being used to render the page.

config.action_view.annotate_template_file_names adds HTML comments to the
rendered output indicating where each template begins and ends.
Co-authored-by: NAaron Patterson <tenderlove@github.com>

* require, require_relative, load by double quotes

We're getting rid of all single quote usage, unless it serves a specific purpose, as per the general style guide.

Follow-up to #37516.

Follow-up to #37053.  The `*.sqlite3-*` .gitignore entries added in that
commit subsume previous `*.sqlite3-journal` entries.

Add ActionText installer rake task back after changes in #35085. Forwards the installer to run new ActionText generator

* Use rails_command instead of run (will also print "rails" in the output)
* Generally tune colors: print green for the status updates,
  red for the warning to get the eye.
* Combine migration copying into running one task and pass FROM.
  Generates "create_tables.engine_name.rb" migrations.
* Slim some variables and style the copy_file invocation.

This change introduces a rich text object to make
it easier to confirm it context is existing or not.

If we have a class like below.

class Information < ApplicationRecord
  has_rich_text :notes
end

Before:
i = Information.new
i.notes? => NoMethodError
i.notes = "Some sample text"
i.notes.present? => true

After:
i = Information.new
i.notes? => false

i.notes = "Some sample text"
i.notes? => true

A regression introduced in 764803e0 caused blobs to appear as HTML content attachments instead of file / image attachments when editing rich text content. This change restores the original intended behavior.

References: https://github.com/rails/rails/pull/35485, https://github.com/basecamp/trix/issues/706

Rails 6.0 introduces parallel testing and the default degree of parallelism is configured based on the number of CPU.
refer https://github.com/rails/rails/pull/34735 https://github.com/rails/rails/pull/31900

When any minitest executed under the OS where 2 or more CPU available,
SQLite 3 database files are not git-ignored.

Also updated other files which ignores SQLite database files.

* Steps to reproduce

```
$ git clone https://github.com/yahonda/rep_ignore_sqlite3_databases.git
$ cd rep_ignore_sqlite3_databases/
$ bin/rails test
$ git status
```

* Expected behavior:

- No `Untracked files:`

* Actual behavior:

- SQLite 3 database files appeared

```
$ git status
On branch master
Untracked files:
  (use "git add <file>..." to include in what will be committed)

	db/test.sqlite3-0
	db/test.sqlite3-1
	db/test.sqlite3-2
	db/test.sqlite3-3
	db/test.sqlite3-4
	db/test.sqlite3-5

nothing added to commit but untracked files present (use "git add" to track)
$
```

Fixes that converting deeply nested elements could exceed the stack level.

- The sanitizer has been changed to safe_list_sanitizer.
- deprecate white_list_sanitizer

In most cases it works now without explicit require because it's accidentally required through
active_support/core_ext/date_and_time/calculations.rb where we still call `try`,
but that would stop working if we changed the Calculations implementation and remove the require call there.

Adds an attachment button to the Trix toolbar that improves overall file upload usability, especially on mobile devices where files can't be dragged / dropped.

References:
- https://github.com/basecamp/trix/releases/tag/1.2.0
- https://github.com/basecamp/trix/pull/619
- https://github.com/basecamp/trix/issues/582

Fixes that file attachments without captions would not be represented in plain text generated from rich-text content, causing ActionText::RichText#present? to return false.

Closes #36607.