Refactor parser for modularity

[gnikit]

Breaks the AST nodes of the parser into separate module files.
Important to keep the code clean.

TODO:

• Increase converage
• Fix poor quality code Issues
• Simpligy certain parts of the AST nodes

[codecov]

Codecov Report

Attention: 254 lines in your changes are missing coverage. Please review.

Comparison is base (b06a833) 87.54% compared to head (df9f621) 87.51%.

Files	Patch %	Lines
fortls/parsers/internal/type.py	61.06%	44 Missing ⚠️
fortls/parsers/internal/ast.py	86.19%	33 Missing ⚠️
fortls/parsers/internal/subroutine.py	83.43%	28 Missing ⚠️
fortls/parsers/internal/utilities.py	86.55%	25 Missing ⚠️
fortls/parsers/internal/variable.py	84.41%	24 Missing ⚠️
fortls/parsers/internal/scope.py	86.52%	19 Missing ⚠️
fortls/parsers/internal/function.py	77.92%	17 Missing ⚠️
fortls/parsers/internal/method.py	79.26%	17 Missing ⚠️
fortls/parsers/internal/base.py	84.33%	13 Missing ⚠️
fortls/parsers/internal/submodule.py	89.47%	8 Missing ⚠️
... and 11 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #333      +/-   ##
==========================================
- Coverage   87.54%   87.51%   -0.04%     
==========================================
  Files          12       35      +23     
  Lines        4567     4756     +189     
==========================================
+ Hits         3998     4162     +164     
- Misses        569      594      +25     

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

[gnikit]

I have gone line by line-by-line through the newly created files and the coverage is identical (bar a +1 line coverage in the BLOCK AST node, function req_named_end).