include token exchange requirements doc

[havetisyan]

Description

docs for the #3100

Contribution Checklist:

• The pull request does not introduce any breaking changes
• I have read the contribution guidelines.
• Create an issue and link to the pull request.

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[gemini-code-assist]

Summary of Changes

Hello @havetisyan, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces comprehensive documentation for the Athenz ZTS token exchange features. The new document clarifies the processes, requirements, and validation steps for JWT Authorization Grant token issuance and exchange, as well as access token exchanges for impersonation and delegation. It also provides essential information for integrating external token exchange providers, ensuring a clear understanding of how these critical security mechanisms function within the system.

Highlights

• New Documentation Added: A new document, zts_token_exchange_requirements.md, has been added to the docs directory, detailing the various token exchange mechanisms within Athenz ZTS.
• JWT Authorization Grant (JAG) Token: The documentation covers the requirements and validation processes for both issuing and exchanging JWT Authorization Grant (JAG) tokens.
• Access Token Exchange: Detailed requirements and authorization checks are provided for access token exchanges, specifically for impersonation and delegation scenarios.
• External Provider Support: The document outlines the requirements and configuration for integrating external token exchange providers with Athenz ZTS.

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[gemini-code-assist]

Code Review

This pull request adds documentation for ZTS token exchange requirements. The documentation is comprehensive and covers several important flows. I've made a few suggestions to improve clarity, consistency, and fix some minor typos and formatting issues in the new markdown file.