Trajectory scanning plan

[Relm-Arrowny]

Fixes #26

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 34.78261% with 30 lines in your changes missing coverage. Please review.
✅ Project coverage is 95.65%. Comparing base (d8e1a65) to head (8d4cf51).

Files with missing lines	Patch %	Lines
...uesky/beamlines/p99/plans/sample_stage_scanning.py	34.78%	30 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##              main      #64      +/-   ##
===========================================
- Coverage   100.00%   95.65%   -4.35%     
===========================================
  Files           28       29       +1     
  Lines          645      691      +46     
===========================================
+ Hits           645      661      +16     
- Misses           0       30      +30     

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[Relm-Arrowny]

Tested it the plan run but, I cannot seem to trigger detector.