Implement selector expressions

[FollowTheProcess]

Summary

[codecov]

Codecov Report

❌ Patch coverage is 68.33333% with 19 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.9%. Comparing base (0d96605) to head (dddd352).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/syntax/resolver/resolver.go	0.0%	12 Missing ⚠️
internal/syntax/parser/parser.go	81.8%	1 Missing and 1 partial ⚠️
internal/syntax/token/token.go	0.0%	2 Missing ⚠️
internal/zap/zap.go	50.0%	1 Missing and 1 partial ⚠️
internal/syntax/ast/expression.go	88.8%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##            main    #155     +/-   ##
=======================================
- Coverage   79.3%   78.9%   -0.4%     
=======================================
  Files         27      27             
  Lines       1930    1975     +45     
=======================================
+ Hits        1532    1560     +28     
- Misses       296     312     +16     
- Partials     102     103      +1     

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