Add location for declarations, constructors, and class members

[purefunctor]

This enables the hover, definition, and references capabilities on these positions.

[codecov]

Codecov Report

❌ Patch coverage is 85.61644% with 21 lines in your changes missing coverage. Please review.
✅ Project coverage is 84.47%. Comparing base (ddee2ef) to head (bbaaed1).
⚠️ Report is 11 commits behind head on main.

Files with missing lines	Patch %	Lines
compiler-lsp/analyzer/src/locate.rs	43.75%	0 Missing and 9 partials ⚠️
compiler-core/indexing/src/algorithm.rs	90.41%	6 Missing and 1 partial ⚠️
compiler-core/indexing/src/error.rs	33.33%	2 Missing ⚠️
compiler-core/indexing/src/lib.rs	90.00%	0 Missing and 2 partials ⚠️
compiler-core/lowering/src/algorithm.rs	66.66%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #56      +/-   ##
==========================================
+ Coverage   84.40%   84.47%   +0.06%     
==========================================
  Files          56       56              
  Lines        9035     9127      +92     
  Branches     9035     9127      +92     
==========================================
+ Hits         7626     7710      +84     
+ Misses        952      950       -2     
- Partials      457      467      +10     

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