Gov API versioning for 5.0.0 (final)

[eddyashton]

We currently support 2 gov APIs.

• [ ] We will mark the old ("Classic") API as deprecated in 5.0, and remove it in 6.0.
• [ ] The new API takes a version-string, and we currently only have a preview version. Since the contents of this API are now much firmer, we should replace it with a non-preview API version-string.
• [x] We should take a canonical description of the API (OpenAPI, or TypeSpec, or both) back into this repo to live alongside (and be kept up-to-date with) the corresponding CCF source.

[achamayou]

Link: https://github.com/Azure/azure-rest-api-specs/tree/main/specification/confidentialledger/Microsoft.ManagedCcf

[achamayou]

Goals:

1. Support one API
2. Have that API as close to Azure Standards as possible, in case: a. Services want to expose (some of) it b. Services want to use SDK generation tooling to handle governance