Investigate support for O_APPEND on Linux

[nblumhardt]

See: https://nblumhardt.com/2016/08/atomic-shared-log-file-writes/

I'd guess by now there will be options/support for this in .NET Core, time to come back around to it.

[tjmoore]

Any news on this? This may be a solution to an issue we see with logrotate which causes huge amounts of nulls to appear in the log files. A suggestion is this is caused by not opening the file with O_APPEND. https://stackoverflow.com/questions/64871670/null-value-in-the-beginning-of-log-after-logrotate

[nblumhardt]

@tjmoore no news, though there were some moves being made to support O_APPEND on Linux in .NET 6, which could use another look. Any help with investigation would be appreciated 👍

[nblumhardt]

Superseded by #221