feat: support function return type derivation

[scgkiran]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 78.47534% with 96 lines in your changes missing coverage. Please review.

Project coverage is 61.20%. Comparing base (9b453f5) to head (669326c).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
types/parser/type_derivation.go	79.27%	39 Missing and 7 partials ⚠️
types/types.go	65.00%	14 Missing ⚠️
types/parameterized_struct_type.go	43.75%	6 Missing and 3 partials ⚠️
types/any_type.go	74.07%	6 Missing and 1 partial ⚠️
types/parameterized_map_type.go	58.33%	4 Missing and 1 partial ⚠️
types/parameterized_list_type.go	50.00%	3 Missing and 1 partial ⚠️
types/parameterized_user_defined_type.go	73.33%	3 Missing and 1 partial ⚠️
types/parameterized_decimal_type.go	81.25%	3 Missing ⚠️
types/parameterized_single_integer_param_type.go	81.81%	2 Missing ⚠️
extensions/variants.go	0.00%	0 Missing and 1 partial ⚠️
... and 1 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #80      +/-   ##
==========================================
+ Coverage   59.56%   61.20%   +1.63%     
==========================================
  Files          43       44       +1     
  Lines        9316     9709     +393     
==========================================
+ Hits         5549     5942     +393     
+ Misses       3507     3491      -16     
- Partials      260      276      +16     

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