expose go runtime pprof endpoint

[iyashu]

Describe the problem/challenge you have
We saw one issue where lvm localpv node agent gets stuck without moving ahead with usual execution (syncing node status & other control loop stuck as we don't see any logs) and wanted to debug it further to see any potential deadlock. Since lvm-localpv don't expose any go runtime information, we could not collect the go routine stack traces.

Describe the solution you'd like
Expose go runtime pprof endpoint.

[dsharma-dc]

From the tracking activity on this issue, it seems that there has been some initial work done on this. Need to understand the scope of this work.
@niladrih Do you have idea about this as I see you have done activity on this in the past?

[avishnu]

Seems a low hanging fruit, let's try to target for v4.2.

[avishnu]

Moving this out of the 4.2 release.