Add GetReplicationCapabilities

[falfaroc]

Description

Pairing the implementation branch with the associated unit-test branch.

Implementation of replication feature within PowerFlex. This brings in the retrievals of the replication capabilities which informs the module what PowerFlex is configured for.

GitHub Issues

List the GitHub issues impacted by this PR:

GitHub Issue #
dell/csm#618

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 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
• Backward compatibility is not broken

How Has This Been Tested?

Numerous testing has been done to ensure that replication works and is similar and consistent with other drivers.

• Manual testing between two 3.6 PowerFlex arrays.
• Single cluster replication on PowerFlex.
• Multi cluster replication on PowerFlex.
• Cloud -> On-Prem replication on PowerFlex (single/multi cluster).
• cert-csi replication testing.