Refactor cflib2 package: split flat re-exports into dedicated submodules

[gemenerik]

Move exception types, TOC cache classes, and subsystem types out of cflib2/init.py into dedicated submodules (cflib2.error, cflib2.toc_cache, cflib2.commander, cflib2.log, cflib2.param, cflib2.memory, cflib2.localization, cflib2.platform, cflib2.console, cflib2.high_level_commander). The top-level package now only exports Crazyflie and LinkContext. Relocate trajectory data types (Poly, Poly4D, CompressedStart, CompressedSegment) to memory.py. Update example imports accordingly.

[Copilot]

Pull request overview

This PR reorganizes the Python-facing API surface of cflib2 by moving most Rust-exposed types into dedicated subsystem modules (e.g., cflib2.error, cflib2.toc_cache, cflib2.memory) and keeping the package root focused on core entry points (Crazyflie, LinkContext). Examples and tests are updated to use the new import locations.

Changes:

• Reduce cflib2 top-level re-exports to just Crazyflie and LinkContext.
• Add lightweight subsystem modules that re-export Rust types and define clear __all__ sets (error, log, param, memory, etc.).
• Update examples/tests to import types from the new subsystem modules.

Reviewed changes

Copilot reviewed 15 out of 15 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
tests/test_exceptions.py	Switch exception hierarchy test to read exception types from cflib2.error instead of the root package.
examples/trajectory.py	Fix trajectory primitive imports by using cflib2.memory for Poly/Poly4D.
examples/toc_cache.py	Update cache class imports to come from cflib2.toc_cache.
examples/swarm.py	Update cache class imports to come from cflib2.toc_cache.
cflib2/init.py	Narrow root exports to Crazyflie and LinkContext only.
cflib2/error.py	New exception-focused module re-exporting Rust exception types.
cflib2/toc_cache.py	New module re-exporting TOC cache types from Rust.
cflib2/memory.py	New module re-exporting memory/trajectory-related data types from Rust.
cflib2/commander.py	Repurpose module to export the Commander subsystem wrapper (instead of trajectory primitives).
cflib2/high_level_commander.py	New module re-exporting the HighLevelCommander subsystem wrapper.
cflib2/console.py	New module re-exporting the Console subsystem wrapper.
cflib2/log.py	New module re-exporting log subsystem types.
cflib2/param.py	New module re-exporting parameter subsystem types.
cflib2/platform.py	New module re-exporting platform subsystem types.
cflib2/localization.py	New module re-exporting localization subsystem types.

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[ataffanel]

Looks good!