feat: Use antlr parser to parse the types in extensions

[scgkiran]

1. This needs a go generate changes to pull the grammar from substarit-core and auto generate antlr parser. For now I included the files in this PR.
2. This is just parser replacement. No new functionality added w.r.to loading new extensions or supporting type derivation.

[codecov]

Codecov Report

Attention: Patch coverage is 81.56313% with 92 lines in your changes missing coverage. Please review.

Project coverage is 56.50%. Comparing base (5ba7f5e) to head (1828711).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
types/parser/visitor.go	80.59%	35 Missing and 4 partials ⚠️
types/parser/parse.go	68.65%	18 Missing and 3 partials ⚠️
extensions/variants.go	38.09%	12 Missing and 1 partial ⚠️
types/any_type.go	0.00%	6 Missing ⚠️
types/parameterized_decimal_type.go	63.63%	4 Missing ⚠️
types/parameterized_user_defined_type.go	97.32%	3 Missing ⚠️
types/parameterized_map_type.go	85.71%	2 Missing ⚠️
types/parameterized_single_integer_param_type.go	89.47%	2 Missing ⚠️
types/parameterized_struct_type.go	84.61%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #64      +/-   ##
==========================================
+ Coverage   55.00%   56.50%   +1.50%     
==========================================
  Files          36       38       +2     
  Lines        8177     8227      +50     
==========================================
+ Hits         4498     4649     +151     
+ Misses       3476     3382      -94     
+ Partials      203      196       -7     

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[jacques-n]

Let's update codecov as part of this patch to ignore the newly generated files.

[scgkiran]

Let's update codecov as part of this patch to ignore the newly generated files.

Done

[EpsilonPrime]

I would expect tests to use GetErrors() instead of GetError() to detect when multiple errors appear (not just the one expected one).