refactor: move diagnostics to dedicated class

[TimothyMakkison]

Refactor: move diagnostics descriptors to separate file

• Will use InternalsVisibleTo to expose descriptors for future feat: add incremental generator tests #1829 changes.
• Ideally refit could do with some more descriptors, this should be a future PR

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.79%. Comparing base (6ebeda5) to head (1e99360).
Report is 106 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1842      +/-   ##
==========================================
- Coverage   87.73%   83.79%   -3.94%     
==========================================
  Files          33       36       +3     
  Lines        2348     2456     +108     
  Branches      294      346      +52     
==========================================
- Hits         2060     2058       -2     
- Misses        208      316     +108     
- Partials       80       82       +2     

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[github-actions]

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