(Breaking Change) Generate update ID at call time if not set

[Quinn-With-Two-Ns]

Current the SDK generates an Update ID, if not is set, when UpdateOptionsBuilder.build is called. This PR changes the behaviour so the Update ID is generated when the update request is made. This is done to:

• Match the behaviour of WorkflowID in WorkflowOptions
• Match other SDK's behaviour
• Prevent the confusing case where reusing an option without an ID set causes one one update request when the customer tried to make two, see the test updateWorkflowReuseOptions.

[cretz]

Makes sense to delay this until inside of root interceptor

[Quinn-With-Two-Ns]

@cretz I set the ID before the interceptor so the interceptor has access to the ID, this is important for things like tracing interceptors . This is also consistent with the rest of the Java SDK.

[cretz]

Hrmm, ok. Some other SDKs do differently, but I agree it's more important to be intra-SDK consistent here than inter-SDK consistent.