Adding support for creating Codespaces and getting available machine types

[Aaron-Junker]

Resolves #2915

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Before the change?

• Adding two new functions to the Codespaces API:

MachinesCollection GetAvailableMachinesForRepo(string repoOwner, string repoName, string reference = null);
Codespace Create(string owner, string repo, NewCodespace newCodespace);

• Plus two new types: MachinesCollection and NewCodespace

• Plus one new StringEnum:

    public enum CodespaceLocation
    {
        [Parameter(Value = "EuropeWest")]
        EuropeWest,
        [Parameter(Value = "SoutheastAsia")]
        SoutheastAsia,
        [Parameter(Value = "UsEast")]
        UsEast,
        [Parameter(Value = "UsWest")]
        UsWest
    }

• When retrieving a codespace the location is now also included.

After the change?

• This new API additions allow the creation of new codespacesm
• retrieving the location of a Codespace,
• aswell as getting available machine types for a repository

Pull request checklist

• Tests for the changes have been added (for bug fixes / features)
• Docs have been reviewed and added / updated if needed (for bug fixes / features)

Does this introduce a breaking change?

Please see our docs on breaking changes to help!

• Yes
• No

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