Soft tigger STXM scan

[Relm-Arrowny]

Fix #34

Added stxm_fast plans, see #34 for detail description.

Instructions to reviewer on how to test:

1. Run unit tests.
2. Please ignore jupyter_tests folder, it is mostly sandbox/record keeping for me.
3. It should work but I am mostly worry about correctness and best practice any feedback would be much appreciated.

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (dfce760) to head (05e8d00).

Additional details and impacted files

@@            Coverage Diff             @@
##              main       #35    +/-   ##
==========================================
  Coverage   100.00%   100.00%            
==========================================
  Files           10        14     +4     
  Lines          202       326   +124     
==========================================
+ Hits           202       326   +124     

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[Relm-Arrowny]

This is far from ready but am worry that this is not the right way to go about it, in pacifically the logic of this function:_fast_scan_1d. I am wondering if you have time could you have look and make sure I have not missed a better way of doing it. @DominicOram @callumforrester @stan-dot

[Relm-Arrowny]

Flyable motor may be better way of doing this.,

[callumforrester]

@Relm-Arrowny this may be for a later PR but you should consider starting to use scanspec