Move knative.dev/pkg/source.StatsReporter to eventing/pkg/metrics/source.StatsReporting - 1/n

[dprotaso]

Part of: knative/pkg#608

tl;dr I'm moving metrickeys that are specific to a subproject out of knative.dev/pkg. Metrickeys for sources were moved to here: #5586 this moves the upstream (knative.dev/pkg/source) StatsReporter to this repo as well.

Why land this in knative/eventing?
I looked at pkg.go.dev and imports of knative.dev/pkg/source and knative.dev/pkg/metrics/metricskey is fairly minimal. All the imports I saw also pull in knative.dev/eventing thus I opt to land it here.

I'll only need to update the following repos after this PR merges

knative.dev/eventing-kafka
knative.dev/eventing-rabbitmq/pkg/adapter

Proposed Changes

• 🧹 move knative.dev/pkg/source.StatsReporter to eventing/pkg/metrics/source.StatsReporter
• 🧹 run update-deps.sh

Release Note

NONE

Docs

[dprotaso]

/assign @n3wscott

[knative-metrics-robot]

The following is the coverage report on the affected files.
Say /test pull-knative-eventing-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
pkg/adapter/v2/main.go	72.2%	68.9%	-3.3
pkg/metrics/source/stats_reporter.go	Do not exist	78.9%

[codecov]

Codecov Report

Merging #5587 (2a9f5e5) into main (5add485) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #5587   +/-   ##
=======================================
  Coverage   82.66%   82.66%           
=======================================
  Files         198      198           
  Lines        6172     6172           
=======================================
  Hits         5102     5102           
  Misses        743      743           
  Partials      327      327           

Impacted Files	Coverage Δ
pkg/adapter/v2/cloudevents.go	81.91% <ø> (ø)
pkg/adapter/v2/main.go	60.86% <ø> (ø)
pkg/adapter/v2/main_message.go	48.71% <ø> (ø)

---

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[dprotaso]

Going to do this in three passes

1. Define aliases to the upstream source stats reporter in eventing (this PR)
2. Migrate the downstream implementations to use said aliases
3. Drop the aliases in favour of the implementation living in eventing

[dprotaso]

/retest

[n3wscott]

/lgtm
/approve

[knative-prow-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dprotaso, n3wscott

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[dprotaso]

/retest

[dprotaso]

broker.go:114: Internal error occurred: failed calling webhook "webhook.eventing.knative.dev": Post "https://eventing-webhook.knative-eventing-i176os6le1.svc:443/defaulting?timeout=10s": No SSH tunnels currently open. Were the targets able to accept an ssh-key for user "gke-c190e44660dd464fbfb9"?

Something's up with GKE