2773 add vernier support

[hiker]

Adds a psydata wrapper and (gocean) example for using Vernier.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.88%. Comparing base (9fe3a1d) to head (23385fc).
Report is 11 commits behind head on master.

Additional details and impacted files

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##           master    #2820   +/-   ##
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  Coverage   99.88%   99.88%           
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  Files         359      359           
  Lines       50258    50258           
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  Hits        50202    50202           
  Misses         56       56           

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[arporter]

Thanks Joerg. It all looks fine. Just a few typos and I think the default directory name for the location of Vernier should be capitalised.
I've been unable to actually test the code yet as I can't build Vernier (see MetOffice/Vernier#154). I'll do that next time.

[hiker]

Ready for next review.

[arporter]

Thanks for those changes and for helping me to get Vernier built.
I can now confirm I've built and run GOcean eg5 using the Vernier profiling.
I'll need to check the integration tests but this should be ready to go now.

[arporter]

The integration tests were all fine apart from NEMOv.4 which had a weird network error when attempting to upload performance results to mongoDB. Clearly not the fault of this PR. Therefore, I will bring this to master and proceed to merge.