feat: Allow the creation of multiple user-assigned managed identities

[cjtous1]

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Description

As part of my subscription vending process, I would like to be able to create more than 1 user-assigned managed identities.
As a specific example, I would like to create 2 UMIs per subscription for using different credentials when using terraform plan and apply respectively.
Right now, this module limits you to create only 1 UMI unless I missed something...

Describe the solution you'd like

My suggestion would be to do something similar to resource group creation and role assignment creation and allow a map of user-assigned managed identities to be created.

[kewalaka]

I came to log the same thing, and found this. Yes @cjtous1 you're correct, the current implementation only supports one umi.

I also have use cases where a map would be more appropriate. When doing configuration-driven terraform, the map key is a useful mechanism to reference between resources.