Skip event Lua to Rust struct conversion if there are no active event streams

[rkusa]

Converting an event to a Rust struct is a costly operation (not as costly as Lua -> JSON -> Rust would be though). We should thus update the implementation to only make the conversion if necessary.

Implementation:

• Check whether either the log level is set to debug, or if there is at least on active events stream.
• If yes, convert the event to a struct and continue as usual
• If no, just ignore the event

[rurounijones]

The title is for event streams but the comment talks about units

Check whether either the log level is set to debug, or if there is at least on active units stream.

I am guessing we actually want this for both the unit and event streams? (and the hook env chat stream)?

[rkusa]

Oops, you are right, I've updated the issue (to talk about the event stream) 👍 . This is only relevant for the events stream. The units stream is polling based, so there is no unit pushed to the server if there are no active streams and the message stream isn't deserializing a Lua table to a Rust struct (just takes a string).