Add azuread_directory_roles data source

[alexwilcox9]

This PR adds a data source that enables the lookup of all activated directory roles in the tenant.

My use case for this is as a dynamic way to populate roles in a conditional access policy but I'm sure there are other use cases that would benefit from it.
Down the line we could look to add the ability to filter specific roles based on ID or name much like the azuread_users data source

Let me know your feedback and any changes that are needed, thanks!

[manicminer]

Thanks for this @alexwilcox9! Sorry for the delay in reviewing, just a few minor changes which I'll roll in below and this LGTM 👍

[github-actions]

This functionality has been released in v2.32.0 of the Terraform Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

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[github-actions]

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