feat(IAM Identity): add service to the project

[padamstx]

PR summary

This PR adds the IAM Identity service to the project.

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

[padamstx]

cc: @pooraniss-ibm

[codecov]

Codecov Report

Merging #48 into master will decrease coverage by 0.01%.
The diff coverage is 93.63%.

@@            Coverage Diff             @@
##           master      #48      +/-   ##
==========================================
- Coverage   94.04%   94.02%   -0.02%     
==========================================
  Files          16       17       +1     
  Lines       15628    16413     +785     
==========================================
+ Hits        14697    15432     +735     
- Misses        931      981      +50     

Impacted Files	Coverage Δ
ibm_platform_services/iam_identity_v1.py	93.62% <93.62%> (ø)
ibm_platform_services/__init__.py	100.00% <100.00%> (ø)

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[ibm-devx-automation]

🎉 This PR is included in version 0.13.0 🎉

The release is available on GitHub release

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