Register custom exceptions for Python bindings

[gemenerik]

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[Copilot]

Pull request overview

This PR introduces dedicated Python exception types for the Rust-backed cflib2 bindings, so Python callers can catch specific Crazyflie error conditions rather than a generic runtime error.

Changes:

• Add a set of custom PyO3 exception types mirroring crazyflie_lib::Error variants and map Rust errors to these Python exceptions.
• Register the exception types in the _rust Python module during module initialization.
• Re-export the exceptions from cflib2/__init__.py and include them in __all__.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 4 comments.

File	Description
rust/src/lib.rs	Registers the new exception types with the _rust module at import time.
rust/src/error.rs	Defines custom exceptions, registers them on the module, and updates to_pyerr to return specific exception subclasses.
cflib2/init.py	Re-exports the new exceptions at the package root and updates __all__.

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