Add Fabric Bot configuration for managing "WaitingFor" labels for issues in home repo

[heng-liu]

Fix: https://github.com/NuGet/Client.Engineering/issues/1054

Testing:
Tag "Transferred issue" if it's transferred from vsfeedback or other github repo.
Example: #11039

Replace tag "WaitingForCustomer" with "WaitingForClientTeam" when the author comments on an issue.
Example: #11020

Replace tag "WaitingForClientTeam" with "WaitingForCustomer" when client team comments on an issue.
Example: #10110 (comment)

Remove any "WaitingFor" label when the issue is closed
Example: #11011

[heng-liu]

Hi @NuGet/nuget-client Please help review the PR so that we could enable the configurations when this PR gets merged. Thanks!

[nkolev92]

I don't really have expertise to truly review some of these changes so I'm happy to approve, but if possible, I'd like to learn how this file can be edited?
Maybe a guide can be added somewhere? Is there a tool that can be used for edits?

[heng-liu]

Thanks for reviewing and the great question @nkolev92!
Here is the link for Fabric Bot configuration introductions:
https://microsoft.sharepoint.com/teams/FabricBot/SitePages/Config-as-code.aspx

Unfortunately, there is no JSON schema for Fabric Bot configuration file yet.
But you may see the configuration by checking the screenshots in the linked issue. It's kind of straight forward.
The configuration file is exported from the configuration page https://aka.ms/fabricbotconfig after testing.