[D9] REST Block Data for Decoupled Drupal

Ran a quick standards scan. See results below:

FILE: /rest_block_data/rest_block_data.info.yml
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FOUND 0 ERRORS AND 4 WARNINGS AFFECTING 4 LINES
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  7 | WARNING | All dependencies must be prefixed with the project name, for example "drupal:"
  8 | WARNING | All dependencies must be prefixed with the project name, for example "drupal:"
  9 | WARNING | All dependencies must be prefixed with the project name, for example "drupal:"
 10 | WARNING | All dependencies must be prefixed with the project name, for example "drupal:"
-----------------------------------------------------------------------------------------------

FILE: /rest_block_data/README.txt
-----------------------------------------------------------------------
FOUND 0 ERRORS AND 5 WARNINGS AFFECTING 5 LINES
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 15 | WARNING | Line exceeds 80 characters; contains 110 characters
 17 | WARNING | Line exceeds 80 characters; contains 168 characters
 48 | WARNING | Line exceeds 80 characters; contains 121 characters
 49 | WARNING | Line exceeds 80 characters; contains 123 characters
 52 | WARNING | Line exceeds 80 characters; contains 139 characters
-----------------------------------------------------------------------


FILE: /rest_block_data/rest_block_data.module
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
FOUND 28 ERRORS AND 1 WARNING AFFECTING 27 LINES
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  1 | ERROR   | [x] Missing file doc comment
  4 | WARNING | [ ] Format should be "* Implements hook_foo().", "* Implements hook_foo_BAR_ID_bar() for xyz_bar().",, "* Implements hook_foo_BAR_ID_bar() for xyz-bar.html.twig.", "* Implements hook_foo_BAR_ID_bar() for
    |         |     xyz-bar.tpl.php.", or "* Implements hook_foo_BAR_ID_bar() for block templates."
  5 | ERROR   | [x] Whitespace found at end of line
  7 | ERROR   | [x] Doc comment long description must end with a full stop
 10 | ERROR   | [x] Opening brace should be on the same line as the declaration
 11 | ERROR   | [x] Line indented incorrectly; expected 2 spaces, found 4
 12 | ERROR   | [x] Array indentation error, expected 6 spaces but found 8
 13 | ERROR   | [x] Array indentation error, expected 6 spaces but found 8
 14 | ERROR   | [x] Array indentation error, expected 6 spaces but found 8
 15 | ERROR   | [x] Array indentation error, expected 6 spaces but found 8
 16 | ERROR   | [x] Array indentation error, expected 6 spaces but found 8
 17 | ERROR   | [x] Array indentation error, expected 6 spaces but found 8
 18 | ERROR   | [x] Array indentation error, expected 6 spaces but found 8
 19 | ERROR   | [x] Array indentation error, expected 6 spaces but found 8
 20 | ERROR   | [x] Array indentation error, expected 6 spaces but found 8
 21 | ERROR   | [x] Array indentation error, expected 6 spaces but found 8
 24 | ERROR   | [x] Line indented incorrectly; expected 2 spaces, found 4
 25 | ERROR   | [x] Line indented incorrectly; expected 4 spaces, found 8
 26 | ERROR   | [x] Line indented incorrectly; expected 6 spaces, found 12
 26 | ERROR   | [x] Inline control structures are not allowed
 28 | ERROR   | [x] Line indented incorrectly; expected 4 spaces, found 8
 29 | ERROR   | [x] Line indented incorrectly; expected 2 spaces, found 4
 35 | ERROR   | [x] Namespaced classes/interfaces/traits should be referenced with use statements
 36 | ERROR   | [x] Opening brace should be on the same line as the declaration
 37 | ERROR   | [x] Line indented incorrectly; expected 2 spaces, found 4
 38 | ERROR   | [x] Line indented incorrectly; expected 4 spaces, found 8
 39 | ERROR   | [x] Case breaking statement indented incorrectly; expected 10 spaces, found 12
 39 | ERROR   | [x] Concat operator must be surrounded by a single space
 40 | ERROR   | [x] Line indented incorrectly; expected 2 spaces, found 4
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PHPCBF CAN FIX THE 28 MARKED SNIFF VIOLATIONS AUTOMATICALLY
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Thank you for your contribution! I am going to update your account.

These are some recommended readings to help with excellent maintainership:

• Dries' post on Responsible maintainers
• Best practices for creating and maintaining projects
• Maintaining a drupal.org project with Git
• Commit messages - providing history and credit
• Release naming conventions.
• Helping maintainers in the issue queues

You can find more contributors chatting on the IRC #drupal-contribute channel. So, come hang out and stay involved.
Thank you, also, for your patience with the review process.
Anyone is welcome to participate in the review process. Please consider reviewing other projects that are pending review. I encourage you to learn more about that process and join the group of reviewers.

I thank all the dedicated reviewers as well.