Adds Abilities Explorer

[karmatosed]

What?

This is an initial very raw version PR to add an Abilities Explorer to the plugin. Responds to #62.
For now this adds a new menu item where you can see the abilities. You can also view or test them
Requires 6.9 beta to work.

Why?

Responds to the proposal in #62 and focuses on making them visible whilst providing a learning opportunity.

How?

This is a simpler implementation, adding a menu item and keeping it totally seperate as proposed for features.

Testing Instructions

Once using branch and installed you should be able to access it from Abilities menu item.

Screenshots or screencast

Note: as this is a work in progress going to keep as a draft until both decided on as direction and had some robust code review. This is being created from an experiment so there likely are code dragons - let’s slay them!

[codecov]

Codecov Report

❌ Patch coverage is 0.94787% with 627 lines in your changes missing coverage. Please review.
✅ Project coverage is 12.27%. Comparing base (e76b0b2) to head (0491146).
⚠️ Report is 6 commits behind head on trunk.

Files with missing lines	Patch %	Lines
...ncludes/Features/Abilities_Explorer/Admin_Page.php	0.00%	272 Missing ⚠️
...es/Features/Abilities_Explorer/Ability_Handler.php	0.00%	135 Missing ⚠️
...udes/Features/Abilities_Explorer/Ability_Table.php	0.00%	126 Missing ⚠️
...Features/Abilities_Explorer/Abilities_Explorer.php	5.05%	94 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##              trunk      #63       +/-   ##
=============================================
- Coverage     48.48%   12.27%   -36.22%     
- Complexity       45      207      +162     
=============================================
  Files             6       10        +4     
  Lines           198      831      +633     
=============================================
+ Hits             96      102        +6     
- Misses          102      729      +627     

Flag	Coverage Δ
unit	12.27% <0.94%> (-36.22%)	⬇️

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