Add Module to IR

[drhagen]

Currently, FunctionDefinitions are valid Statements. This is not true in C. Pretending this is true make implementation of LLVM conversion difficult. This adds the concept of a Module to the IR AST, which currently contains only a list of definitions, each of which currently can only be FunctionDefinitions.

imports may be added to Module in the future, but are not currently implemented.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 98.70130% with 1 line in your changes missing coverage. Please review.

Project coverage is 88.84%. Comparing base (c3ec481) to head (980fa0a).

Files	Patch %	Lines
src/tensora/iteration_graph/_generate_ir.py	96.55%	0 Missing and 1 partial ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master      #67      +/-   ##
==========================================
- Coverage   89.08%   88.84%   -0.24%     
==========================================
  Files          54       54              
  Lines        2986     2995       +9     
  Branches      536      538       +2     
==========================================
+ Hits         2660     2661       +1     
- Misses        249      257       +8     
  Partials       77       77              

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