Migrate off the deprecated package `golang.org/x/exp/inotify`

[yujuhong]

golang.org/x/exp/inotify has been deleted (see https://github.com/golang/exp/tree/master/inotify)
cadvisor should switch to using fsnotify, or something equivalent.

xref: kubernetes/kubernetes#40123

[dashpole]

reopening via #1807. Issue: kubernetes/kubernetes#55909

[dashpole]

It looks like the switch to fsnotify actually worked... The summary test passes if we use a non-restarting pod, but fails with the current version of the test. The test checks the summary api for pods that restart. But when they restart, we loose metrics for it. I am not sure how it passes when we are using inotify...