PoC for supporting uniffi bindgen with multiple crates

[Hinton]

Uniffi supports using types from dependent crates, https://mozilla.github.io/uniffi-rs/proc_macro/index.html#types-from-dependent-crates. Consider a crate a which depends on b. This results in two python files being generated, a.py and b.py.

The previous solution relied on manually building the expected bindgen filename, which worked well with just a single python output. This atlernative approach relies on finding all python files in the target directory and including them in the wheel.

At the current stage this is a fairly brute force approach which resolves my use case. I would appreciate feedback on the general approach.

Resolves #1904

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