1725 i21 energy devices

[Relm-Arrowny]

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 89.85507% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 99.03%. Comparing base (62c1000) to head (18f2bdf).
⚠️ Report is 24 commits behind head on 1663-i09-energy.

Files with missing lines	Patch %	Lines
src/dodal/devices/i21/i21_apple2.py	36.36%	7 Missing ⚠️

Additional details and impacted files

@@                 Coverage Diff                 @@
##           1663-i09-energy    #1727      +/-   ##
===================================================
- Coverage            99.09%   99.03%   -0.07%     
===================================================
  Files                  276      277       +1     
  Lines                10218    10252      +34     
===================================================
+ Hits                 10126    10153      +27     
- Misses                  92       99       +7     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.