[Feature Request] report Exchange permission model in HealthChecker

[boogieshafer]

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Exchange can operate in 3 different permissions models and the healthchecker script should probably report which model is in use in an environment given the importance of that setting to overall domain security

Shared Permissions
RBAC Split Permissions
Active Directory Split Permissions

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Given the risks of privilege escalation to Domain Admin inherent in the default Shared Permissions model it seems like its going to be increasingly important for Exchange deployments and admins to have better visibility to the attack paths currently enabled in their deployments

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reference: https://learn.microsoft.com/en-us/exchange/permissions/split-permissions/split-permissions?view=exchserver-2019

reference: https://adsecurity.org/?p=4119