[WIP] Procedural Modification for Rust

[john-b-yang]

Add Procedural Modification techniques for Rust

The original SWE-smith work introduces a line of "Procedural Modification" techniques, where programmatic entities are converted into an AST. The AST is then randomly manipulated (e.g. changing an operator, inverting a condition, removing a condition), and the resulting AST is converted back into code to serve as a bug.

Procedural Modifications currently work for both Python and Golang. This is a WIP PR to make it work for Rust.

Typically, the steps to implement procedural modifications are as follows:

1. Ensure that swesmith/bug_gen/adapters/<language>.py has the _analyze_properties function implemented. This function is what will take each CodeEntity and assign to it one or more CodeProperty tags.
2. Implemented procedural modifications under swesmith/bug_gen/procedural/<language>/. You can see a number of existing examples for how this works. Each PM, defined as a class, takes in a CodeEntity and produces a BugRewrite object.
3. In swesmith/bug_gen/procedural/<language>/__init__.py, create a MODIFIERS_<LANG> variable which points at a list of procedural modification classes. Then add the extension -> MODIFIERS_<LANG> map to MAP_EXT_TO_MODIFIERS.
4. Add tests as needed.

For this PR, the following have been implemented:

• Step 1
• Step 2
• Step 3
• Step 4

[codecov]

Codecov Report

❌ Patch coverage is 95.26066% with 10 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
swesmith/bug_gen/adapters/rust.py	91.42%	9 Missing ⚠️
tests/conftest.py	80.00%	1 Missing ⚠️

Files with missing lines	Coverage Δ
swesmith/constants.py	94.78% <100.00%> (+0.04%)	⬆️
tests/bug_gen/adapters/test_rust.py	100.00% <100.00%> (ø)
...ts/bug_gen/procedural/golang/test_go_operations.py	100.00% <ø> (ø)
tests/bug_gen/procedural/golang/test_go_remove.py	100.00% <ø> (ø)
tests/conftest.py	95.31% <80.00%> (-1.41%)	⬇️
swesmith/bug_gen/adapters/rust.py	93.88% <91.42%> (-3.52%)	⬇️

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