spread rest obj type elem

[kevinbarabash]

• wip
• add SpreadRest ObjTypeElem and update Infer.fs and Unify.fs to use that instead of intersection types

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 78.64769% with 60 lines in your changes missing coverage. Please review.

Project coverage is 83.93%. Comparing base (4190d3e) to head (74d1698).

Files	Patch %	Lines
src/Escalier.TypeChecker/Unify.fs	81.00%	38 Missing ⚠️
src/Escalier.TypeChecker/BuildGraph.fs	42.85%	8 Missing ⚠️
src/Escalier.Codegen/Codegen.fs	0.00%	5 Missing ⚠️
src/Escalier.Data/Library.fs	40.00%	3 Missing ⚠️
src/Escalier.TypeChecker/Infer.fs	92.50%	3 Missing ⚠️
src/Escalier.TypeChecker/Visitor.fs	60.00%	2 Missing ⚠️
src/Escalier.TypeChecker/Folder.fs	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #323      +/-   ##
==========================================
- Coverage   84.16%   83.93%   -0.23%     
==========================================
  Files          23       23              
  Lines       11625    11768     +143     
  Branches     1603     1647      +44     
==========================================
+ Hits         9784     9878      +94     
- Misses       1841     1890      +49     

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