[FEAT]: Allow managing Copilot for Business seats with new CopilotClient

[dylan-asos]

Describe the need

A new API is available (in beta) that allows managing Copilot for Business license allocations.

https://docs.github.com/en/rest/copilot/copilot-for-business?apiVersion=2022-11-28

Implement the API methods in a new CopilotClient class, allowing integration opportunities to manage Copilot setup.

SDK Version

No response

API Version

No response

Relevant log output

No response

Code of Conduct

• I agree to follow this project's Code of Conduct

[nickfloyd]

@dylan-asos Thanks for the call out here. This does make me think that we need some way to indicate that the underlying APIs for a given set of SDKs are beta - so that when they do change it's an understood "breaking change" cc: @kfcampbell

Related: octokit/octokit.js#2492

[dylan-asos]

I'll probably pick this up as have a vested interest. Let me know if any thoughts around the beta/breaking change element to this.

Any way to have a vNext/Beta path + publish a pre-release version of the nuget package? e.g. 7.0.1-beta. Or, trying to keep that overhead out of the process and prefer to keep everything on stable semver?

[kfcampbell]

My vote would be to follow the Microsoft Nuget pre-release guidelines and then detail the beta changes in our release notes. If we wanted to get more specific, perhaps we could explore using custom attributes to mark specific functions, though I don't think that's necessary at this point.

[dylan-asos]

Have started work - sorry it's been a bit slow coming.

Branch over here -> https://github.com/octokit/octokit.net/compare/main...dylan-asos:octokit.net:feature/copilot?expand=1

Going to get assign/remove/search and top level billing status implemented first, then will come back and do the team assignment work on a second pass. I think these methods would give people some immediate value.

PR hopefully this week.

[dylan-asos]

Draft PR for any early feedback @kfcampbell @nickfloyd.