Converting MX Beamlines to device manager

[adaudon]

Fixes #1765

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

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.08%. Comparing base (a2e9629) to head (4a05f61).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1788      +/-   ##
==========================================
- Coverage   99.11%   99.08%   -0.04%     
==========================================
  Files         281      282       +1     
  Lines       10667    10685      +18     
==========================================
+ Hits        10573    10587      +14     
- Misses         94       98       +4     

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