Is your feature request related to a problem? Please describe.
Currently, it is not possible to get a list of queries and signals a workflow is listening on. So UI has to emit an unsupported query and parse the list of supported ones from the message.

Describe the solution you'd like
Add a query that would return metadata about workflow. Lists of supported queries and signals should be included into the result.

Describe alternatives you've considered
Use worker query (not implemented yet) instead. But as the set of queries and signals that workflow accepts is dynamic a normal query would make more sense.

Additional context
An error is logged by the service every time UI needs to find out the list of supported queries.

The query should be supported by all SDKs.