Always output entire log messages (#11)

[ecampidoglio]

This PR ensures that log messages are printed to the console's stdout in their entirety by flushing the internal buffer of the StreamWriter after every write operation.

Resolves #11

[JFFby]

It looks like this behavior should be configurable and disabled by default, because it may hit performance.

[ecampidoglio]

It looks like this behavior should be configurable and disabled by default, because it may hit performance.

I see your point, but correctness is more important than performance. The current implementation causes incomplete log lines to be sent to stdout (see #11). If you have an external log collector like Filebeat, this will prevent the affected lines from being parsed correctly.

[sungam3r]

@ecampidoglio Your suggestion in understandable but I'm sure it's not applicable due to the design of this repo. Just look at the name - it contains word fast. AutoFlush = true goes against it and breaks all sense. The core mission of this repo is performance. Devs end up here when they need performance. If they need correctness then they just use well-known standard console sink for serilog.

So I would not merge this. At least, I would make it configurable, but again - such setting will look strange here.