Implement Event Orchestrations API

[EronWright]

Closes #424

Implements the full Event Orchestrations API, including:

• List Event Orchestrations
• Get an Orchestration
• Update an Orchestration
• Delete an Orchestration
• Create an Orchestration
• Get the Router for a Global Event Orchestration
• Update the Router for a Global Event Orchestration
• Get the Unrouted Orchestration for a Global Event Orchestration
• Update the Unrouted Orchestration for a Global Event Orchestration
• Get the Service Orchestration for a Service
• Update the Service Orchestration for a Service
• Get the Service Orchestration active status for a Service
• Update the Service Orchestration active status for a Service

Also implements minimal CLI commands.

[EronWright]

@theckman or @ChuckCrawford please take a look.

[ChuckCrawford]

@EronWright : thank you for doing this and my apologies for the delay here.

I have left a couple of minor initial comments.

I have not been able to fully review the OrchestrationRouter work for correctness quite yet. We were just thinking about preparing a 1.6.0 release. How would you feel about us targeting this for a 1.7.0 release so that folks have time to test this properly?

[ChuckCrawford]

@EronWright : I promise I have not forgotten about this. I am just not as familiar with this API yet and am trying to check on a few things along the way here. I will get back to you soon.

[ChuckCrawford]

Okay I have left a few comments / suggestions.

If you can resolve the merge conflicts (maybe rebase off of main?), fix the build, and address the few comments then we should be okay to merge this.

[EronWright]

@ChuckCrawford your feedback has been addressed.

[ChuckCrawford]

Thank you for contributing this [and for your patience with the review process] @EronWright!