Update guidelines to include unique identifiers...

[markweitzel]

In order to ensure we have proper coverage when creating linters, cadl libraries, etc. we need to be able to link back to specific rules within the the guidelines.

[tg-msft]

See this link to a specific guideline https://azure.github.io/azure-sdk/dotnet_introduction.html#dotnet-general-follow-general-guidelines (where you'll notice all the checkboxes are hyperlinked) and see the markdown that generated it at https://github.com/Azure/azure-sdk/blob/main/docs/dotnet/introduction.md?plain=1#L53.