Retrieves the user metadata and attributes from the UserId in an identity store.
See https://www.paws-r-sdk.com/docs/identitystore_describe_user/ for full documentation.
identitystore_describe_user(IdentityStoreId, UserId)[required] The globally unique identifier for the identity store, such as
d-1234567890. In this example, d- is a fixed prefix, and
1234567890 is a randomly generated string that contains numbers and
lower case letters. This value is generated at the time that a new
identity store is created.
[required] The identifier for a user in the identity store.