Feature: Custom User Types

We often find ourselves copy and pasting type blocks in terraform templates. This makes it more difficult to maintain.

Please consider adding custom types as a language construct or extension. It would allow someone to specify and name a type/object definition and reuse it in code.

Bicep has a similar feature described here: https://learn.microsoft.com/en-us/azure/azure-resource-manager/bicep/user-defined-data-types

The issue names no files, tests, or entry points. Start by comparing the requested construct with the linked Bicep user-defined data types documentation; done means HCL supports named type or object definitions that can be reused in Terraform templates.

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