Update all ExprKinds to wrap structs

[kevinbarabash]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 77.31959% with 22 lines in your changes missing coverage. Please review.

Project coverage is 84.04%. Comparing base (685f22a) to head (9669405).

Files	Patch %	Lines
src/Escalier.Codegen/Codegen.fs	31.25%	11 Missing ⚠️
src/Escalier.TypeChecker/Mutability.fs	57.14%	3 Missing ⚠️
src/Escalier.TypeChecker/Visitor.fs	50.00%	3 Missing ⚠️
src/Escalier.Data/Library.fs	60.00%	2 Missing ⚠️
src/Escalier.Parser/Parser.fs	95.23%	2 Missing ⚠️
src/Escalier.TypeChecker/Helpers.fs	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #356      +/-   ##
==========================================
+ Coverage   84.00%   84.04%   +0.04%     
==========================================
  Files          22       22              
  Lines       12316    12347      +31     
  Branches     1757     1757              
==========================================
+ Hits        10346    10377      +31     
  Misses       1970     1970              

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