Updates for trajectory fly scans

[iain-hall]

• Inject devices from i20_1.py environment into plans.
• Refactored common code used for sequence table scans to a new functions (create_seqtable, seq_table_scan).
• Use energy-bragg conversion functions from spectroscopy_bluesky.common.quantity_conversion
• Refactor conversion to encoder counts from user position to a function, to avoid using MRES directly.
• New function (setup_trajectory_scan_pvs) to set coordinate system on trajectory scan controller needed for PMac scans to work correctly.
• seq_table plan uses multiple repeats of the sequence table to capture positions for multiple motor sweeps, rather than putting all positions for multiple motor sweeps in a single table.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 51 lines in your changes missing coverage. Please review.
✅ Project coverage is 33.83%. Comparing base (4ba0965) to head (da4cd6a).

Files with missing lines	Patch %	Lines
..._bluesky/i20_1/plans/direct_turbo_slit_movement.py	0.00%	49 Missing ⚠️
src/spectroscopy_bluesky/i20_1/plans/__init__.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #65      +/-   ##
==========================================
+ Coverage   33.13%   33.83%   +0.69%     
==========================================
  Files          16       16              
  Lines         685      671      -14     
==========================================
  Hits          227      227              
+ Misses        458      444      -14     

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