Replication observability metrics

[nitesh3108]

PR Submission checklist

It enables API support for volume_mirror_transfer_rate_cma_view which will be helpful to pull the Replication related stats for Sync and Metro at volume level.

GitHub Issues

List the GitHub issues impacted by this PR:

GitHub Issue #
dell/csm#1443

Common PR Checklist:

• Have you made sure that the code compiles?
• Have you commented your code, particularly in hard-to-understand areas
• Did you run tests in a real Kubernetes cluster?
• Have you maintained backward compatibility

Description of your changes:

• Executed gopowerstore unit tests

Earlier unit-test report

PASS
coverage: 82.2% of statements
ok      github.com/dell/gopowerstore    0.069s  coverage: 82.2% of statements

Current unit-test report

=== RUN   TestClientIMPL_VolumeMirrorTransferRate
--- PASS: TestClientIMPL_VolumeMirrorTransferRate (0.00s)

PASS
coverage: 83.8% of statements
ok      github.com/dell/gopowerstore    0.064s  coverage: 83.8% of statements

[adarsh-dell]

Can this 2000 be a constant value instead of hardcoding it here like this way?

[nitesh3108]

done

[adarsh-dell]

LGTM.

[AkshaySainiDell]

Suggested change

	customHeader.Del("DELL-VISIBILITY")
	customHeader.Del("DELL-VISIBILITY")
	apiClient.SetCustomHTTPHeaders(customHeader)

[nitesh3108]

Done