Add necessary files for OPCUA ioc build

[esmith1729]

Description of work

OPCUA IOC module that should be general purpose, for other OPC servers that need an IOC configuration.

OPCUA_01.cmd should be placed in C:\Instrument\Settings\config\[instrument name]\configurations\opcua folder, alongside a private key found on the network shares

To test

• Please confirm that this builds and runs correctly with the OPC PLC on MAPS, and that the OPCUA module looks accurately like other EPICS IOCs (this is my first time porting a new module to EPICS like this).

• MAPS: Provide support to read pressure values from vacuum PLC IBEX#8586

Acceptance criteria

• The IOC builds and can run properly (it connects to the MAPS PLC and reads values accurately.

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Code Review

• A copy of the manual has been placed on the shared drive
• Pertitent information has been stored in the wiki
• Does the IOC conform to IBEX standards?
  • PV naming.
  • Disable records
  • Record simulation
  • Finishing touches
• If an OPI has been modified, does it conform to the style guidelines?
• Do the IOC and support module conform to the new build guidelines
• Have the changes been recorded appropriately in a PR for release notes?
• Is the device's flow control setting correct? For most devices flow control should be OFF.

Functional Tests

• IOC responds correctly in:
  • Devsim mode
  • Recsim mode
  • Real device, if available
• Supplementary IOCs (..._0n where n>1) run correctly
• Log files do not report undefined macros (serach for macLib: macro to find instances of macLib: macro [macro name] is undefined...

Final steps

• Update the IOC submodule in the main EPICS repo. See Git workflow page for details.
• Reviewer has merged the associated PR for the release notes