[typescript-angular] Mark deprecated operations with the @deprecated JSDoc tag in typescript-angular

Created by: daiscog

When generating a client from a spec that contains deprecated operations, the generated client does not indicate to the consumer that the operations have been deprecated.

Example deprecated operation:

paths:
  /example:
    post:
      operationId: examplePost
      deprecated: true

Related issues/PRs

Akin to https://github.com/OpenAPITools/openapi-generator/issues/6474