client improvements

[M-jerez]

• atm the client fails if remote method metadata is not found locally: we should change it so the request is still made to the server if there is no local metadata, (this way we could use the client without serialization and validation and make the @mionkit/runtime dependency optional
• an initial work has done to Implement promises that declare the type of the thrown error, but there was some error with linting and async function expecting a promise return. we should continue this work as having types error is very handy.