Add role to OrganizationMembership class

[ameesha]

Description

New "role" parameter which is used in the User Management OrganizationMemberships API

Documentation

Does this require changes to the WorkOS Docs? E.g. the API Reference or code snippets need updates.

[ ] Yes

If yes, link a related docs PR and add a docs maintainer as a reviewer. Their approval is required.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.95%. Comparing base (e65ec1e) to head (5d81194).

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #236      +/-   ##
==========================================
+ Coverage   85.89%   85.95%   +0.05%     
==========================================
  Files          31       31              
  Lines        1234     1239       +5     
==========================================
+ Hits         1060     1065       +5     
  Misses        174      174              

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