Fix walking python bindings

[Flova]

The migration of the walking to the generate_parameter_library required a significant rework of the way parameters are set when the Python walk wrapper is used. Coincidentally the new approach simplifies the logic a bit, which is nice I guess.

I also added a few longer comments explaining the reasoning behind some design choices.

[Flova]

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Walkthrough

The pull request introduces modifications to the PyWalk, WalkNode, and PyWalkWrapper classes within the bitbots_quintic_walk package. Key changes include the addition of new optional parameters for handling walk and MoveIt parameters, updates to method signatures with explicit return type annotations, and a reorganization of parameter handling logic in the constructors. The onSetParameters method has been removed from WalkNode, and new internal functions have been introduced for parameter serialization and deserialization.

Changes

Files	Change Summary
bitbots_motion/bitbots_quintic_walk/.../py_walk.py	Updated PyWalk constructor to accept walk_parameters and moveit_parameters. Added serialize_parameters function. Explicit return type annotations added to several methods.
bitbots_motion/bitbots_quintic_walk/.../walk_node.hpp	Modified WalkNode constructor to replace parameters with moveit_parameters. Removed onSetParameters method.
bitbots_motion/bitbots_quintic_walk/.../walk_node.cpp	Updated WalkNode constructor to handle moveit_parameters. Simplified parameter handling logic.
bitbots_motion/bitbots_quintic_walk/.../walk_pywrapper.hpp	Modified PyWalkWrapper constructor to include moveit_parameter_msgs.
bitbots_motion/bitbots_quintic_walk/.../walk_pywrapper.cpp	Updated PyWalkWrapper constructor to accept moveit_parameter_msgs. Introduced deserialize_parameters function for processing parameter messages. Updated binding in PYBIND11_MODULE.

Possibly related PRs

• #596: The changes in the PyWalk class constructor to accept walk_parameters and moveit_parameters are directly related to the modifications made in the main PR, which also updates the constructor in the same way.

Suggested reviewers

• timonegk
• jgueldenstein
• jaagut

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