Support SCIM Protocol Versioning

[jmpesp]

https://datatracker.ietf.org/doc/html/rfc7644#section-3.13 states:

   The Base URL MAY be appended with a version identifier as a separate
   segment in the URL path.  At the time of this writing, the identifier
   is 'v2'.  If specified, the version identifier MUST appear in the URL
   path immediately preceding the resource endpoint and conform to the
   following scheme: the character 'v' followed by the desired SCIM
   version number, e.g., a version 'v2' User request is specified as
   /v2/Users.  When specified, service providers MUST perform the
   operation using the desired version or reject the request.  When
   omitted, service providers SHOULD perform the operation using the
   most recent SCIM protocol version supported by the service provider.