[Feature]: Increase max amount of returned management groups in "Get-AzManagementGroup"

### Description of the new feature

Hello,

today I "accidentally" discovered that "Get-AzManagementGroup" would only return 999 objects, even if there are more. There is no parameter to get all management groups. What can I do?
To iterate over all management groups, I currently have use a recursive function that follows the children of every management group.

### Proposed implementation details (optional)

_No response_