docs: [IAC-2246]: IaCM module registry

[richardblack-Harness]

Description

• Add module registry documentation
• JIRA

Screenshot / Preview

PRs must meet these requirements to be merged:

• [x] Successful preview build.
• [x] Code owner review.
• [x] No merge conflicts.
• [x] Release notes/new features docs: Feature/version released to at least one prod environment.

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