Checks whether or not the current session is capable of querying SMDA

A route to check whether the client is capable of querying SMDA APIs with their current session. The requirements for querying the SMDA API via this API are:

1. A valid session
2. An SMDA subscription key in the user's .fmu API key configuration
3. A valid SMDA access token scoped to SMDA's user_impersonation scope

A successful response from this route indicates that all other routes on the SMDA router can be used.