Periodically log stats about inotify resources usage on the system

[aduffeck]

Example log:

2025-04-02T09:56:16+02:00 INF Inotify usage stats duration=126.907156ms instances="87/128 (67.97%)" line=/home/andre/src/opencloud/reva/pkg/storage/fs/posix/tree/inotifywatcher.go:237 pkg=rgrpc service=storage-users watches="27727/504714 (5.49%)"
2025-04-02T10:01:16+02:00 INF Inotify usage stats duration=82.352794ms instances="88/128 (68.75%)" line=/home/andre/src/opencloud/reva/pkg/storage/fs/posix/tree/inotifywatcher.go:237 pkg=rgrpc service=storage-users watches="27746/504714 (5.50%)"

[butonic]

hm .... should this just be a metric that we expose?

[aduffeck]

As discussed in person, we'll log the stats for now but it would definitely be nice to have proper metrics for this in the future.