Adding metrics for request total, latency and size

[courageJ]

The PR adds the metrics handler and basic metrics for requests.

[k8s-ci-robot]

Keywords which can automatically close issues and at(@) or hashtag(#) mentions are not allowed in commit messages.

The list of commits with invalid commit messages:

• 5001fb2 Bump github.com/envoyproxy/go-control-plane from 0.13.1 to 0.13.3 (Bump github.com/envoyproxy/go-control-plane from 0.13.1 to 0.13.3 #155)
• 1252b8f Bump github.com/onsi/ginkgo/v2 from 2.22.0 to 2.22.2 (Bump github.com/onsi/ginkgo/v2 from 2.22.0 to 2.22.2 #138)
• 6abf2e3 Bump google.golang.org/grpc from 1.69.0 to 1.69.2 (Bump google.golang.org/grpc from 1.69.0 to 1.69.2 #133)

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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: courageJ
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