feat: Admin Management Functionality

[MattDavisRV]

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Describe the change
This change includes functionality to manage your Org via Admin API. This change does not include all endpoints and functionality related to the Admin API. As I have time, and if no one else has added them, I will submit another PR for the missing functionality.

Provide OpenAI documentation link
Admin API Documentation

Describe your solution
Implemented functionality to:

• Manage Admin API Keys
• Manage Organization Invites
• Manage Organization Users
• Manage Projects
• Manage Project Users
• View Organization Costs

Tests
Tests have been created for all functionality added. Test methodology was copied from existing tests in the library.

Additional context
I'm unsure why the Sanity checks are failing, they were locally as well, but unrelated to my changes (jsonschema).

Issue: #XXXX

[codecov]

Codecov Report

Attention: Patch coverage is 54.93827% with 146 lines in your changes missing coverage. Please review.

Project coverage is 92.13%. Comparing base (774fc9d) to head (2ec4c2c).
Report is 88 commits behind head on master.

Files with missing lines	Patch %	Lines
admin_project.go	59.09%	18 Missing and 9 partials ⚠️
admin_user.go	50.98%	17 Missing and 8 partials ⚠️
admin_invite.go	58.62%	16 Missing and 8 partials ⚠️
admin_key.go	52.00%	16 Missing and 8 partials ⚠️
admin_project_user.go	63.63%	16 Missing and 8 partials ⚠️
admin_usage.go	33.33%	15 Missing and 7 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #953      +/-   ##
==========================================
- Coverage   98.46%   92.13%   -6.33%     
==========================================
  Files          24       33       +9     
  Lines        1364     2110     +746     
==========================================
+ Hits         1343     1944     +601     
- Misses         15      112      +97     
- Partials        6       54      +48     

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