Add functionality to robot to do a robot load

[DominicOram]

Fixes DiamondLightSource/hyperion#1234

Instructions to reviewer on how to test:

1. Confirm unit tests and system tests pass

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 93.52%. Comparing base (30815f1) to head (a8034f3).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #374      +/-   ##
==========================================
+ Coverage   93.45%   93.52%   +0.06%     
==========================================
  Files          90       90              
  Lines        3377     3412      +35     
==========================================
+ Hits         3156     3191      +35     
  Misses        221      221              

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[d-perl]

LGTM, thanks!