Add / Support ExoManagementRoleAssignment Resource in Microsoft365DSC

[atdheekurteshi]

ISSUE TITLE:

Add / Support ExoManagementRoleAssignment Resource in Microsoft365DSC
ExoManagementRoleAssignment is not supported / included in Microsoft365DSC

ISSUE DESCRIPTION (this template):

ExoManagementRoleAssignment:
Property 'SecurityGroup' and 'Role' should be added in class ExoManagementRoleAssignment and should reference the EXOAddressList property 'Role' as a Policy it should be nested with this policy to work as a Required property

ExoManagementRoleAssignment is momentary not supported please could you add as a new Microsoft365DSC Resource.

On class ExoManagementRoleAssignment property 'SecurityGroup' and 'Role' is momentary not supported could you add it as a new property.

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