Move XCPD Revoke Into Its Own Transaction

[slagesse-epic]

Is your feature request related to a problem? Please describe.

The XCPD Health Data Locator and Revoke Option supplement adds a Revoke message to ITI-55. The Revoke message is really an entirely separate message, with its own Message Semantics, Trigger Events, Expected Actions, etc. separate from the main Cross Gateway Patient Discovery message in ITI-55. Therefore, it would make more sense for the supplement to introduce this message as its own transaction rather than add it on to ITI-55.

Describe the solution you'd like

Update the XCPD Health Data Locator and Revoke Option supplement to remove the Revoke message from ITI-55 and instead create a new transaction to specify that message.

This should be a purely editorial change - the actual message and expected actions will remain the same with the only difference being how it is documented.

Describe alternatives you've considered

N/A

Additional context

This was originally proposed in CP-ITI-1258, but it was decided that handling this as a work item would be cleaner due to the way the XCPD Health Data Locator and Revoke Option supplement needs to be refactored. Instead of balloting this as a CP, it would be released as an updated supplement for public comment and then trial implementation.