OPIs for Merlin OPCUA

[Chsudeepta]

Description of work

This one adds the OPIs required for Merlin OPCUA implementation.

Ticket

Fixes

Acceptance criteria

1. Must display all the TPG300 vacuum sensor fields
2. Must display the fields from additional controllers.
3. Should pass the standard OPI format checks.

Unit tests

System tests

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Code Review

• Is the code of an acceptable quality?
• If the change is to an OPI, does the check_opi_format.py script in C:\Instrument\Dev\ibex_gui\base\uk.ac.stfc.isis.ibex.opis pass?
• Do the changes function as described and is it robust?
• Is there associated PR for the release notes?

Final Steps

• Reviewer has also merged the release notes