Ignore unkown events in the client

[vxgmichel]

In order to be able to add new events without breaking compatibility, we should ignore unrecognized events in the client.

At the moment, getting an unknown event would stop the monitor:

parsec-cloud/libparsec/crates/client/src/monitors/connection.rs

Line 218 in 02313cd

| ConnectionError::BadContent

[mmmarcos]

According to @touilleMan, because this is specific to events it should be done directly when the event is deserialized.

[touilleMan]

The pragmatic approach would be to just ignore bad deserialization of response:

parsec-cloud/libparsec/crates/client_connection/src/authenticated_cmds/sse.rs

Lines 97 to 98 in d1ac906

	let cooked =
	T::api_load_response(raw.as_ref()).map_err(|_| ConnectionError::BadContent)?;

This should be very easy to do, then we should add a sensible comment and a test... aaaaand we're done ! ^^