add metrics endpoint for csi

[aniruddha2000]

How to categorize this PR?

/kind enhancement
What this PR does / why we need it:

This PR exposes endpoint and port for csi metrics using external APIs

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:

Breaking changes:

[ske-prow]

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[nschad]

You also need to add the port to the Service

[aniruddha2000]

@nschad not sure about the namespace, the ccm service exist in kube-system ns.

[ske-prow]

@aniruddha2000: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-gardener-extension-provider-stackit-integration-tests	d318c21	link	true	/test pull-gardener-extension-provider-stackit-integration-tests

Full PR test history. Your PR dashboard. Command help for this repository.
Please help us cut down on flakes by linking this test failure to an open flake report or filing a new flake report if you can't find an existing one. Also see the gardener testing guideline for how to avoid and hunt flakes.

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