Describe the bug
A clear and concise description of what the bug is.
To Reproduce
Kotlin 2.0.21, kotlin-rpc 0.10.1
Create a descriptor for a method that returns Flow<...>
Expected behavior
The descriptor's returnType.kType is Flow<...>
Actual behavior
returnType.kType is just the flow's type argument.
Additional context
If this needs to be kept for internal reasons, a isFlow property on the RpcType or method descriptor would be helpful. isNonSuspendFunction seems to provide the same value, but doesn't necessarily have the same contract.