Add i19 optics beamline definition

[noemifrisina]

Fixes #1090
See also i19-bluesky#33

Instructions to reviewer on how to test:

1.Run dodal connect i19-optics and verify it connects

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
• If changing the API for a pre-existing device, ensure that any beamlines using this device have updated their Bluesky plans accordingly
• Have the connection tests for the relevant beamline(s) been run via dodal connect ${BEAMLINE}

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.69%. Comparing base (6e0fd7b) to head (9215b16).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1091   +/-   ##
=======================================
  Coverage   97.69%   97.69%           
=======================================
  Files         160      161    +1     
  Lines        6638     6650   +12     
=======================================
+ Hits         6485     6497   +12     
  Misses        153      153           

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[DominicOram]

Great, thank you!