[Feature Request] Add impersonation metrics

[golanglemonade]

The openlane API supports impersonation of users to do things like:

• run jobs on behalf of a user
• temporary access for support
• etc.

It would be nice to have metrics added to track counts of requests:

Add metrics with the type (start/stop) and increment the count

Handler:

core/internal/httpserve/handlers/impersonation.go

Line 245 in 33f16f9

func (h *Handler) logImpersonationEvent(action string, auditLog *auth.ImpersonationAuditLog) error {

The new metric can be added to the metrics package:
https://github.com/theopenlane/core/blob/main/pkg/metrics/vars.go

With a helper added to the metrics/helpers.go:
https://github.com/theopenlane/core/blob/main/pkg/metrics/helpers.go

[AAYUSH-SPIDEY-SHARMA]

hi @golanglemonade i would like to work on this issue, can you please assign this issue to me

[golanglemonade]

done @AAYUSH-SPIDEY-SHARMA !