get Env By Uri
Returns an env (a set of environmental variables) from the configuration used to instantiate the client.
Return
an env, or null if an env is not found at the given URI
Parameters
uri
the URI used to register the env
Returns an env (a set of environmental variables) from the configuration used to instantiate the client.
an env, or null if an env is not found at the given URI
the URI used to register the env