feat[lang]: @raw_return decorator

[charles-cooper]

What I did

How I did it

How to verify it

ex.

@external
@raw_return
def foo() -> Bytes[32]:
    b"asdlkfj"

Commit message

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Description for the changelog

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[codecov]

Codecov Report

Attention: Patch coverage is 75.00000% with 6 lines in your changes missing coverage. Please review.

Project coverage is 92.52%. Comparing base (4463878) to head (39941e4).
Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
vyper/semantics/types/function.py	64.70%	3 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4568      +/-   ##
==========================================
- Coverage   92.56%   92.52%   -0.05%     
==========================================
  Files         123      123              
  Lines       17494    17530      +36     
  Branches     2957     2968      +11     
==========================================
+ Hits        16194    16220      +26     
- Misses        896      901       +5     
- Partials      404      409       +5     

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