Add `--pid-file` option to write PID files on startup. The PID filename
is specified by the argument after `--pid-file`. If the PID file already exists, influxd will exit unless the `--overwrite-pid-file` flag is also used.
Example: `influxd --pid-file /var/lib/influxd/influxd.pid`
PID files are automatically removed when the influxd process is shutdown.
Closes: #25498
(cherry picked from commit c35321b470)
(cherry picked from commit 48f760065b)
e9ea8cfb31