[FEATURE] Possibility to automatically add Yoast SEO functionality to custom records

[RinyVT]

Summary

This PR can be summarized in the following changelog entry:

• Added a possibility to configure full Yoast SEO functionality for custom records by adding a few lines to the TCA Overrides
• For full explanation check the updated documentation
  • Tip: Checkout branch and run ddev docs to get the generated version

Relevant technical choices:

• The setup of RecordUtility and RecordRegistry is based on the CategoryRegistry of core
• The TCA for a registered record is expanded with a yoast_seo section with all the settings, in the frontend (and for updating database schema) these sections are read and converted to Record objects which are cached
  • Couldn't find another easy way of doing this, CategoryRegistry has its own hardcoded calls within core
• Dropped support for PHP<7.4, this is for the upcoming major version 9

Test instructions

This PR can be tested by following these steps:

• Following the documentation, configure for a record and see if all the backend fields are available and the frontend renders correctly (pagetitle, metatags, canonical)

Quality assurance

• I have tested this code to the best of my abilities
• I have added unittests to verify the code works as intended

Fixes #507