Draft: Distributed DAQPath

This draft MR marks the maturity of the distributed DAQPath refactor. A very small outline:

• now every signal in the daqpath token ring runs in the same direction
• division in a "master" and in "nodes" that are regions-friendly
• separation between core functions, data capture and OT DTC integration
• full daisy chained ipbus control for OT DTC
• new cocotb test set for core features

Things to complete before MR

• repository cleanup
• daqpath_master entity cocotb test
• polish CI workflow
• test integration in OT DTC
• test communication with software