Make SWE-smith work for non-Python codebases.

[john-b-yang]

These thoughts are still very draft-stage and I'm thinking about what to put in CONTRIBUTING.md but I wanted to first gauge how much interest there is in making SWE-smith work for non-Python codebases.

The over-arching goal that I think could be cool, is

1. To make SWE-smith work for any codebases that have good test coverage.
2. To continue scaling SWE-smith task instance collection (perhaps to 500k instances across 500 repos representing 10 languages by end of summer?)

To this end, I think bug generation is probably the main thing that would need to be changed.

I'm starting to think about / work on how to do SWE-smith for JS/TS as a very first step.

Issue generation and any training related procedures already in the repo probably wouldn't change.

But please feel free to comment if this seems interesting.