26 create oav device

[evalott100]

Acceptance criteria:

• Set up all the PVs used in the operation of OAV centring.

Fixes #26

[codecov]

Codecov Report

Merging #27 (5fe9143) into main (2461275) will increase coverage by 1.69%.
The diff coverage is 89.74%.

❗ Current head 5fe9143 differs from pull request most recent head 9c74854. Consider uploading reports for the commit 9c74854 to get more accurate results

@@            Coverage Diff             @@
##             main      #27      +/-   ##
==========================================
+ Coverage   84.30%   86.00%   +1.69%     
==========================================
  Files           3        4       +1     
  Lines         172      250      +78     
==========================================
+ Hits          145      215      +70     
- Misses         27       35       +8     

Impacted Files	Coverage Δ
tickit_devices/oav/oav_edge_detection.py	89.74% <89.74%> (ø)

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[DominicOram]

Generally looks good, I like the fake pin shapes! Could you address the minor comments in code and remove the empty MO-IOC.db file?

[DominicOram]

On starting the IOCs I get a bunch of errors about asyn links and I/O Intr not valid. Can you set them to soft records or remove them to make sure it doesn't error