fix: Replace existing timing with workspace:GetServerTimeNow(), resolve race condition with server creating event after client load

[chexburger]

This PR fixes a timing issue resulting from the use of tick() using local timezones instead of universal time. It also fixes timing issues with os.clock() being different on the server and client from client time drift by using a synchronized time provided by the server.
Additionally this fixes a race condition that causes a client error when the server is slower than the client to require the module.

[chexburger]

The version is not bumped up in this PR and should be adjusted prior to merging.
I tested this solution with a client that had the correct time and a client that was 2 seconds behind real time. Both encountered identical and desired behavior when switching to :GetServerTimeNow().

This will resolve #10