driver: rust: expand documentation for driver infrastructure

Add documentation about generic driver infrastructure, representing a
guideline on how the generic driver infrastructure is intended to be
used to implement bus specific driver APIs.

This covers aspects such as the bus specific driver trait, adapter
implementation, driver registration and custom device ID types.

Reviewed-by: Daniel Almeida <daniel.almeida@collabora.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Alexandre Courbot <acourbot@nvidia.com>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Link: https://lore.kernel.org/r/20250722150110.23565-4-dakr@kernel.org
Signed-off-by: Danilo Krummrich <dakr@kernel.org>

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