feat(lib): Introduce TerraformDynamicBlock to enable iterator usage on blocks

[ansgarm]

Closes #1798

Open tasks

• Add unit test for error case if TerraformDynamicBlock is used at the wrong position and tried to be resolved (should throw an error; e.g. could happen if passed to a Terraform function)
• How to handle normal lists (non-block type lists)? Convert to some other expression (using Terraform functions) or at least throw an Error if used at an invalid location. Not sure how to detect this yet.
• Add edge provider tests for iteration in the various languages
• Add tests that invoke at least terraform validate to confirm result is valid (might be something to add to edge provider tests)
• Add docs to iterator docs with an example for block level iteration (in each language) will follow in a separate PR as they will be based on a branch that is not merged yet
• make sure there are follow-up issues for all new todo: comments in the code base

[DanielMSchmidt]

Looks good, great work! Just a couple of comments :)

[DanielMSchmidt]

Besides from the missing docs this looks great 👍

[github-actions]

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