move source.StatsReporter from knative.dev/pkg

[dprotaso]

Part of: knative/pkg#608

Part two of #5587

[dprotaso]

/hold - waiting on
knative-extensions/eventing-rabbitmq#362
knative-extensions/eventing-kafka#765

[codecov]

Codecov Report

Merging #5594 (1bb099c) into main (0af15fd) will increase coverage by 0.08%.
The diff coverage is 92.45%.

@@            Coverage Diff             @@
##             main    #5594      +/-   ##
==========================================
+ Coverage   82.71%   82.79%   +0.08%     
==========================================
  Files         198      199       +1     
  Lines        6177     6230      +53     
==========================================
+ Hits         5109     5158      +49     
- Misses        742      744       +2     
- Partials      326      328       +2     

Impacted Files	Coverage Δ
pkg/metrics/source/stats_reporter.go	92.45% <92.45%> (ø)

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[vaikas]

Could we get over the 80% UT bar that we're targeting with all PRs prior to v1.

[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/metrics/source/stats_reporter.go	Do not exist	89.5%

[vaikas]

/test pull-knative-eventing-integration-tests

[dprotaso]

/hold cancel

[vaikas]

/lgtm
/approve

[knative-prow-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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