Extract module address parsing logic

[radeksimko]

Background

We have https://github.com/hashicorp/terraform-registry-address which handles parsing and internal representation of the parsed provider addresses in this codebase and terraform-schema.

We need to also parse and represent module addresses in increasingly more places:

• Fix module calls command for remote modules #872
• Add DocsLink for remote module source attributes terraform-schema#103
• Recognize inputs and outputs of uninitialized remote (Terraform Registry) modules #599

Proposal

Look into Terraform Core's codebase and try to extract the logic which is responsible for parsing the module source from there into https://github.com/hashicorp/terraform-registry-address - presumably as ParseModuleSourceString or similar.

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Related: hashicorp/terraform#28338

[dbanck]

Closed via hashicorp/terraform-registry-address#7 and #891

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