[Cadl APIView] Version 0.3.5

[tjprescott]

Closes #5289.

Updates APIView for the latest release of Cadl compiler and cadl-azure.

• BREAKING CHANGE: removed the --namespace option.
• Updates for cadl compiler 0.40 and cadl-azure 0.26.
• Adds multi-service spec support. Adds the --service option to filter which service to output. If not provided, it will output all services, 1 token file per service.
• Updates logic for --output-file and --version so that they can only use used on a multi-service spec if --service is provided.
• Adds a new option --include-global-namespace to allow rendering the global namespace (which would normally be excluded). (example)
• Fixes a bug where namespaces that are not proper subnamespaces may be included (ex: Azure.Test and Azure.Test2).

TODO

• Update README.md with date once approved, prior to merge and release.

[catalinaperalta]

Thanks for the fix!