Support for-in-if expressions

[radeksimko]

Closes hashicorp/terraform-ls#527

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Follow-up Issues

• Provide snippet of new for-in and for-in-if in [] or {} terraform-ls#1607
• Recognise key & value local references in for expression terraform-ls#1608
• Report [for k, v in set: k] as anti-pattern diagnostic terraform-ls#1609
• Provide completion in unterminated ForExpr #370

[dbanck]

Nice work!

Just a question/suggestion that could also be addressed in a follow-up issue.

[radeksimko]

@dbanck I no longer have push/merge permissions here, so I'll have to leave it up to you to merge 😅

[lukaabicic]

Please fix variable declaration not found error in [2.29.4] version (2024-02-13).
The error occurs when the resources are created with a for_each argument whose values are variables of type list(object()).
The error isn't present in the previous versions.

[dbanck]

@lukaabicic We just released a new version 2.29.5. This fixes the reported bug. The update should appear automatically in VS Code.

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