chore: add type checks for Authorization with new example.

[karel-rehor]

Closes #680

Proposed Changes

• Add type checks in constructor of Authorization
  • verify org_id is a string
  • verify permissions is a list
• Add type check in authorizations_api.create_authorization that argument passed as authorization is of type Authorization.
• Add examples/authorizations.py

Checklist

• CHANGELOG.md updated
• Rebased/mergeable
• A test has been added if appropriate
• pytest tests completes successfully
• Commit messages are conventional
• Sign CLA (if not already signed)

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.36%. Comparing base (2d0adb9) to head (989fb88).
Report is 1 commits behind head on master.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #682   +/-   ##
=======================================
  Coverage   90.36%   90.36%           
=======================================
  Files          40       40           
  Lines        3539     3541    +2     
=======================================
+ Hits         3198     3200    +2     
  Misses        341      341           

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[bednar]

Add new example to the examples/README.md.