1495 make apple2 and pgm start flying in sync

[Relm-Arrowny]

Fixes #1495
Last part of #1467

• Moved EnergySetter to common as it is now generic.
• Added preparable and flyable to EnergySetter.
• Added test,

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 98.73%. Comparing base (12a2407) to head (e8bf28b).

Additional details and impacted files

@@                           Coverage Diff                            @@
##           1480-make-apple2-preparable-and-flyable    #1496   +/-   ##
========================================================================
  Coverage                                    98.73%   98.73%           
========================================================================
  Files                                          236      236           
  Lines                                         8694     8716   +22     
========================================================================
+ Hits                                          8584     8606   +22     
  Misses                                         110      110           

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