requested TypeSpec specifications for the DevOps API

I inquired about TypeSpec specification for the DevOps API in https://github.com/MicrosoftDocs/vsts-rest-api-specs/issues/730. This current code uses its OpenAPI specs with AutoRust, but in the future, hopefully code can be generated from TypeSpec and https://www.npmjs.com/package/@azure-tools/typespec-rust. Just creating this issue to track.