chore: align reqs with WP6.9 merge target

[justlevine]

What

This PR

• Drops the PHPCS/PHPStan min PHPVersion check to 7.2
• Bumps the min WordPress check to 6.8
• Removes the use of text-domains
• Updates the allowed prefixes
• Aligns the initial version number to 0.1.0

in accordance with a planned WordPress 6.9 merge.

Why

We still benefit from the tooling by leaving the composer requirement at 7.4, but keep the codebase mergeable for 6.9 by linting against PHP 7.2.

Part of #13

[codecov]

Codecov Report

❌ Patch coverage is 81.81818% with 4 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (trunk@9806cae). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
...dpoints/class-wp-rest-abilities-run-controller.php	66.66%	4 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##             trunk      #18   +/-   ##
========================================
  Coverage         ?   90.64%           
  Complexity       ?      102           
========================================
  Files            ?        7           
  Lines            ?      556           
  Branches         ?        0           
========================================
  Hits             ?      504           
  Misses           ?       52           
  Partials         ?        0           

Flag	Coverage Δ
unit	90.64% <81.81%> (?)

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[justlevine]

Since this hasn't been reviewed yet, I bumped the version numbers to 0.1.0 to align with what's used elsewhere in c92e1cb

[gziolo]

Thank you for all these improvements 👍🏻