Adds powermax as driver, unit, int and scale test

[delldubey]

Description

• Adds CSI Pwermax as supported driver
• Adds Unit, Int, and scale tests

GitHub Issues

List the GitHub issues impacted by this PR:

GitHub Issue #
dell/csm#1082

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
• [x[ 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?

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

• Unit Test

• PASS
  coverage: 92.4% of statements
  status 0 ok podmon/internal/monitor 12.436s coverage: 92.4% of statements
  PASS
  coverage: 96.8% of statements
  status 0 ok podmon/cmd/podmon 1.575s coverage: 96.8% of statements

• Integration test

• 

[AkshaySainiDell]

LGTM

[adarsh-dell]

LGTM.