Included pprof for profiling the application. (#485)

* Included pprof for profiling the application.

Included pprof for profiling the application.

Signed-off-by: naveen <172697+naveensrinivasan@users.noreply.github.com>

* Update cmd/rekor-server/app/root.go

Co-authored-by: Bob Callaway <bobcallaway@users.noreply.github.com>

* Update cmd/rekor-server/app/root.go

Co-authored-by: Bob Callaway <bobcallaway@users.noreply.github.com>

Co-authored-by: Bob Callaway <bobcallaway@users.noreply.github.com>