feat: change ArgumentList name to FuncParameterList

[scgkiran]

Fixed bugs in matching variadic arguments.

BREAKING CHANGE:

• ArgumentList has been renamed to FuncParameterList.

BREAKING CHANGE:

• The ReturnType method in the FuncDefArgType interface now requires FuncParameterList and actual argument types as parameters.

[scgkiran]

Mostly cleanup and renaming of variables before introducing function return type derivation

[codecov]

Codecov Report

Attention: Patch coverage is 54.16667% with 66 lines in your changes missing coverage. Please review.

Project coverage is 59.58%. Comparing base (c7fc536) to head (402419f).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
types/types.go	37.93%	33 Missing and 3 partials ⚠️
extensions/simple_extension.go	22.72%	17 Missing ⚠️
extensions/variants.go	75.51%	9 Missing and 3 partials ⚠️
types/any_type.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #79      +/-   ##
==========================================
+ Coverage   59.41%   59.58%   +0.16%     
==========================================
  Files          43       43              
  Lines        9221     9314      +93     
==========================================
+ Hits         5479     5550      +71     
- Misses       3497     3505       +8     
- Partials      245      259      +14     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[EpsilonPrime]

Some of the changed lines have no coverage but that's not related to this name change PR.

[jacques-n]

This should have a breaking change commit message, right?

[scgkiran]

This should have a breaking change commit message, right?

Updated the PR title and description.