feat(IAM Policy Management): add service to project

[padamstx]

PR summary

This PR adds the IAM Policy Management service to the project.

Fixes: n/a

PR Checklist

Please make sure that your PR fulfills the following requirements:

• The commit message follows the Angular Commit Message Guidelines.
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• New tests
• Build/CI related changes
• Documentation content changes
• Other (please describe)

What is the current behavior?

What is the new behavior?

Does this PR introduce a breaking change?

• Yes
• No

Other information

[codecov]

Codecov Report

Merging #24 into master will increase coverage by 0.10%.
The diff coverage is 94.99%.

@@            Coverage Diff             @@
##           master      #24      +/-   ##
==========================================
+ Coverage   93.79%   93.90%   +0.10%     
==========================================
  Files          10       11       +1     
  Lines        6387     7006     +619     
==========================================
+ Hits         5991     6579     +588     
- Misses        396      427      +31     

Impacted Files	Coverage Δ
ibm_platform_services/iam_policy_management_v1.py	94.98% <94.98%> (ø)
ibm_platform_services/__init__.py	100.00% <100.00%> (ø)

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[ibm-devx-automation]

🎉 This PR is included in version 0.7.0 🎉

The release is available on GitHub release

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