rpc registry: support for no exceptions

[redrezo]

Just tried the registry and came across three try-catch blocks, which is an issue for me since my project does not support exceptions
I removed them and it seems to work for now but there may be issues I dont know about (at least I found no throw in the sources)

It would be nice to be able to use the registry in exception free projects

edit:
Just ran into the issue that I am not able to 'fail' a request without exceptions - would need some kind of std::expected to jsonrpc error translation..

[stephenberry]

Thanks for drawing more attention to this. I would also like to be able to use the registry without exceptions, and I do think it is feasible with some minor adjustments.

The primary reason for the exceptions is that it allows for handling the standard template library more ergonomically. I'll try to dig into this when I get a chance.

I'm just curious what your use case is that leads you to turn off exceptions? It helps me consider how to architect solutions.