Backport of config generation: escape map keys with whitespace into v1.9

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Backport

This PR is auto-generated from #35754 to be assessed for backporting due to the inclusion of the label 1.9-backport.

The below text is copied from the body of the original PR.

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This PR updates the config generation package so map keys with whitespace are escaped with quotes. This is already handled automatically for the normal attribute generation, and nested blocks are also escaped by default. This PR updates the nested attributes so the keys of nested maps are validated and escaped if necessary. It is only maps that have this problem, attributes in objects cannot contain whitespace and other types (lists, sets, tuples) do not render keys anyway.

The rendering package has this same problem, and so far we've not handled it perfectly but just well enough. We'll continue to do so here, but the code calls out we could modify the HCL library so it exposes the internal functions it uses to detect when escaping is necessary and share those between HCL and Terraform. But so far, we've not had any need to take this too seriously.

Fixes #35752

Target Release

1.9.x

Draft CHANGELOG entry

BUG FIXES

• config generation: escape map keys with whitespaces

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Overview of commits

• f0d06bb

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Reminder for the merging maintainer: if this is a user-visible change, please update the changelog on the appropriate release branch.

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