Replication metrics support added for Powerstore

[shefali-malhotra]

Description

Replication metrics support added for Powerstore.
Added following parameters in volume metrics -

• synchronization BW
• Mirror BW
• Data remaining

GitHub Issues

List the GitHub issues impacted by this PR:

GitHub Issue #
dell/csm#1443

Checklist:

• I have performed a self-review of my own code to ensure there are no formatting, vetting, linting, or security issues
• I have verified that new and existing unit tests pass locally with my changes
• I have not allowed coverage numbers to degenerate
• I have maintained at least 90% code coverage
• I have inspected the Grafana dashboards to verify the data is displayed properly
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• I have maintained backward compatibility

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Please also list any relevant details for your test configuration

• Verified e2e workflow and populated the data on grafana dashboard
  

• Added UTs
  

Manual inspection of the GUI

I have verified that the dashboards show the data properly while generating I/O and storage resources

• Yes

[csmbot]

Can one of the admins verify this patch?