BREAKING CHANGE: Identity and Resource Refactor and Update

[ZanattaMichael]

Pull Request (PR) description

The following pull request performs a major rework of the identity and resources of the module.

1. Re-Working the caching mechanism to focus on enumeration and caching at the execution of the script.
2. Removal of PAT Tokens from Resources.
3. Removal of Api URL's from Resources.
4. Rework of authentication and separating it into it's own command: New-AzDoAuthenticationProvider
5. Introduction of Token retrieval protections to prevent accidental token pipeline leakage.
6. Added the following resources:
   1. xAzDevOpsProjectGroup
   2. xAzDevOpsOrganizationGroup
   3. xAzDevOpsGroupMember
7. Renamed resource: AzDevOpsProject to xAzDevOpsProject

Task list

This Pull Request is currently in draft form and will be updated as more resources and features are added.

• [ ] Added an entry to the change log under the Unreleased section of the file CHANGELOG.md. Entry should say what was changed and how that affects users (if applicable), and reference the issue being resolved (if applicable).
• [ ] Resource documentation updated in the resource's README.md.
• [ ] Resource parameter descriptions updated in schema.mof.
• [ ] Comment-based help updated, including parameter descriptions.
• [ ] Localization strings updated.
• [ ] Examples updated.
• [ ] Unit tests updated. See DSC Community Testing Guidelines.
• [ ] Integration tests updated (where possible). See DSC Community Testing Guidelines.
• [ ] Code changes adheres to DSC Community Style Guidelines.

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