Experiment: Compile down to machine instructions

[JSAbrahams]

Summary

For fun, lets see how far we can get.

Doing this we also uncover some scoping bugs in our outputted Python.
Note that Mamba is stricter than Python with regards to scoping rules, so we need to take care of this in our output.

Added Tests

• We now have some proper tests in execution.rs which check the output of our Mamba program via Python
• And additionally check the output of our program if compiled

For both we execute and check the output via stdout.
Python output we run via a Python interpreter.

We test on MacOS, Windows, and Linux to see if compilation works as expected.

[codecov]

Codecov Report

❌ Patch coverage is 91.20810% with 139 lines in your changes missing coverage. Please review.
✅ Project coverage is 91.31%. Comparing base (aa8541d) to head (9696562).

Files with missing lines	Patch %	Lines
src/backend/python/convert/class.rs	75.65%	28 Missing ⚠️
src/backend/cranelift/convert/definition.rs	90.00%	18 Missing ⚠️
src/backend/cranelift/convert/mod.rs	87.60%	15 Missing ⚠️
src/backend/cranelift/convert/call.rs	89.92%	13 Missing ⚠️
src/main.rs	0.00%	10 Missing ⚠️
src/backend/python/convert/mod.rs	94.97%	9 Missing ⚠️
src/backend/cranelift/convert/control_flow.rs	92.85%	8 Missing ⚠️
src/backend/cranelift/mod.rs	94.81%	7 Missing ⚠️
src/backend/python/ast/mod.rs	90.66%	7 Missing ⚠️
src/backend/cranelift/convert/operation.rs	93.68%	6 Missing ⚠️
... and 8 more

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #474      +/-   ##
===========================================
+ Coverage    90.73%   91.31%   +0.57%     
===========================================
  Files          103      113      +10     
  Lines        14746    15823    +1077     
===========================================
+ Hits         13380    14448    +1068     
- Misses        1366     1375       +9     

Files with missing lines	Coverage Δ
src/backend/cranelift/result.rs	100.00% <100.00%> (ø)
src/backend/python/ast/node.rs	94.64% <ø> (ø)
src/backend/python/convert/builder.rs	91.66% <100.00%> (ø)
src/backend/python/convert/call.rs	75.00% <100.00%> (ø)
src/backend/python/convert/common.rs	100.00% <100.00%> (ø)
src/backend/python/convert/handle.rs	79.16% <100.00%> (ø)
src/backend/python/convert/range_slice.rs	92.15% <100.00%> (ø)
src/backend/python/convert/state.rs	97.10% <100.00%> (ø)
src/backend/python/result.rs	36.00% <ø> (ø)
src/backend/cranelift/primitive.rs	96.87% <96.87%> (ø)
... and 17 more

... and 4 files with indirect coverage changes

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