wip: inlay-hint: prototype inferred return types hint

[aviatesk]

[codecov]

Codecov Report

❌ Patch coverage is 32.14286% with 38 lines in your changes missing coverage. Please review.
✅ Project coverage is 68.15%. Comparing base (8b6a301) to head (23ba059).
⚠️ Report is 205 commits behind head on master.

Files with missing lines	Patch %	Lines
src/inlay-hint.jl	0.00%	31 Missing ⚠️
src/analysis/full-analysis.jl	42.85%	4 Missing ⚠️
src/utils/server.jl	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #172      +/-   ##
==========================================
- Coverage   68.38%   68.15%   -0.23%     
==========================================
  Files          32       32              
  Lines        2581     2638      +57     
==========================================
+ Hits         1765     1798      +33     
- Misses        816      840      +24     

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