Add optimise attenuation scan

[olliesilvester]

Adds functionality to devices to allow for the attenuation_optimisation_plan, for #105

This uses the changes in #94 and #90

[codecov]

Codecov Report

Merging #97 (43b775f) into main (7cadcd9) will increase coverage by 0.58%.
The diff coverage is 94.73%.

❗ Current head 43b775f differs from pull request most recent head 87ea41b. Consider uploading reports for the commit 87ea41b to get more accurate results

@@            Coverage Diff             @@
##             main      #97      +/-   ##
==========================================
+ Coverage   88.51%   89.10%   +0.58%     
==========================================
  Files          56       57       +1     
  Lines        1881     1973      +92     
==========================================
+ Hits         1665     1758      +93     
+ Misses        216      215       -1     

Impacted Files	Coverage Δ
src/dodal/devices/zebra.py	95.03% <68.75%> (+2.17%)	⬆️
src/dodal/devices/xspress3_mini/xspress3_mini.py	97.29% <85.71%> (-1.22%)	⬇️
src/dodal/devices/status.py	94.73% <87.50%> (-5.27%)	⬇️
src/dodal/beamlines/i03.py	88.70% <100.00%> (+1.20%)	⬆️
src/dodal/devices/areadetector/plugins/MJPG.py	97.14% <100.00%> (+0.08%)	⬆️
src/dodal/devices/attenuator.py	100.00% <100.00%> (ø)
src/dodal/devices/detector.py	86.48% <100.00%> (ø)
src/dodal/devices/eiger.py	99.31% <100.00%> (+<0.01%)	⬆️
src/dodal/devices/oav/grid_overlay.py	100.00% <100.00%> (ø)
src/dodal/devices/oav/oav_detector.py	96.15% <100.00%> (ø)
... and 1 more

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[DominicOram]

This is useful to have for testing the Artemis PR but I think we should get #90 and #94 merged, then make a new branch that has any additional changes on it for artemis 701

[olliesilvester]

Moved PR to new branch: #105