Added plan to i23 init

[adaudon]

Fixes #1706

Link to dodal PR (if required): DiamondLightSource/dodal#2023
(remember to update pyproject.toml with the dodal commit tag if you need it for tests to pass!)

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 user on a set of release notes

[codecov]

Codecov Report

❌ Patch coverage is 78.57143% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 92.82%. Comparing base (b63552a) to head (29b638a).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1707      +/-   ##
==========================================
- Coverage   92.84%   92.82%   -0.03%     
==========================================
  Files         156      158       +2     
  Lines        8557     8570      +13     
==========================================
+ Hits         7945     7955      +10     
- Misses        612      615       +3     

Components	Coverage Δ
i24 SSX	77.15% <ø> (ø)
hyperion	98.65% <ø> (ø)
other	98.24% <78.57%> (-0.08%)	⬇️

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