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 96.35%. Comparing base (a08213d) to head (138b6a4).

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%   96.35%   -3.65%     
===========================================
  Files           30       31       +1     
  Lines          777      823      +46     
===========================================
+ Hits           777      793      +16     
- Misses           0       30      +30     

☔ View full report in Codecov by Harness.
📢 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.

[Relm-Arrowny]

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