Bug: API implementations can leak uncaught exceptions

[abeltrano]

Describe the bug
The API implementations currently do not take care to prevent leaking exceptions outside the API boundary.

Steps To Reproduce
N/A

Expected behavior

• No exceptions should ever leak the API boundary, and every gRPC function implementation must always return a value such that the remote client always receives a response.

Actual behavior

• Uncaught exceptions can crash the server and cause the client to time out waiting for a response.