feat(backend): adds python code parsing

[joelsprunger]

Description

Adds a python code parser and invokes it in processors.py
I can easily add TypeScript and Javascript, but these require a bump in the Langchain version, and we probably want to thoroughly test such a change.

Checklist before requesting a review

Please delete options that are not relevant.

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented hard-to-understand areas
• I have ideally added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged

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[StanGirard]

This is so cool 👍

@mamadoudicko @gozineb will take care as I am on vacation

[mamadoudicko]

Nice @joelsprunger,

Thanks!