Add Graph API support for Exchange Admin Center settings

Is your feature request related to a problem? Please describe the problem.

Currently, many important Exchange Admin Center (EAC) settings (such as organization configuration, transport rules, mailbox settings, and audit policies) are only accessible via Exchange Online PowerShell. These configurations are not available through Microsoft Graph API (GA or Beta).

This creates a gap for organizations that want to automate compliance checks, monitoring, and reporting in a scalable way without relying on PowerShell. It also limits integration with modern automation platforms and SDKs that depend on REST APIs.

Describe the solution you'd like.

Microsoft Graph should provide API endpoints to retrieve and manage Exchange Admin Center (EAC) settings, similar to how other Microsoft 365 services are already exposed.

Examples of useful additions include:

• Organization-level settings (equivalent to Get-OrganizationConfig)
• Audit configuration (e.g., AuditDisabled, AuditBypassEnabled)
• Mail flow / transport rules (equivalent to Get-TransportRule)
• Mailbox policies and settings (e.g., litigation hold, mailbox audit settings)

Additional context?

No response

No repository file, test, or entry point is identified. Start by checking how this Go SDK exposes existing Microsoft Graph service areas and whether Exchange settings are available in the upstream API. Done would require a defined API scope and corresponding SDK support for the requested settings.