Add Read Only Attenuator Motor Readout

[CoePaul]

• Add wedge and wheel readout as separate StandardReadable:

  • so that loss of (usage of) any one component does not force a re-write of the source code / runtime error / long timeout when reading.

• Offers each specific absorber the chance to read out its own position relatively quickly without needing to wait for any element which might not even be mounted,

Fixes #ISSUE

Instructions to reviewer on how to test:

1. Do thing x
2. Confirm thing y happens

Checks for reviewer

• Would the PR title make sense to a scientist on a set of release notes
• If a new device has been added does it follow the standards
• If changing the API for a pre-existing device, ensure that any beamlines using this device have updated their Bluesky plans accordingly
• Have the connection tests for the relevant beamline(s) been run via dodal connect ${BEAMLINE}

[codecov]

Codecov Report

❌ Patch coverage is 0% with 35 lines in your changes missing coverage. Please review.
✅ Project coverage is 99.09%. Comparing base (7b8fff3) to head (4e4ec1e).

Files with missing lines	Patch %	Lines
...ess_controlled/read_only_attenuator_motor_squad.py	0.00%	35 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2203      +/-   ##
==========================================
- Coverage   99.34%   99.09%   -0.25%     
==========================================
  Files         367      368       +1     
  Lines       14396    14431      +35     
==========================================
  Hits        14301    14301              
- Misses         95      130      +35     

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