Update azurerm_template_deployment - Support import

[ArcturusZhang]

Fixes #7268

[tombuildsstuff]

hi @ArcturusZhang

Thanks for this PR.

Taking a look through here, whilst this PR does add support for import to this resource - since the template content isn't being returned from the Azure API here, unfortunately this'd lead to a diff here (null -> 'template body').

Whilst we could look to set this field into the state to allow us to track this - after spending some time with this (and #7506) it likely makes more sense to overhaul these resources to support the updated behaviours now present in this API.

In particular, since the API now returns a list of resources provisioned by this ARM Template - we're able to attempt to clean these up during deletion of the ARM Template Deployment (which can be toggled on/off using the features block).

As we're looking to take a different direction here - whilst I'd like to thank you for this contribution I'm going to close this in favour of #8672 which introduces a replacement for this resource, and the existing azurerm_template_deployment resource will be deprecated in version 3.0 of the Azure Provider.

Thanks!

[ghost]

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