feat!: implement module versioning proposal

[amitchell-moz]

Implements https://docs.google.com/document/d/11iJ1qndxV-ElPNzisCkVLoHW4FFOBhmpiSH4DThvQ-s/edit?usp=sharing

This PR also removes semantic-release - after merge this repo will no longer require semantic commit messages/PR titles, and only per-module module_name-X-X-X versions will be generated. (no more vX.X.X top level tags). If we want to keep that around I can revert the delete; these can coexist.

At a high level this PR will:

• Adds github actions to generate per-module version tags, based off of changed files + PR labels
• Generate a per-module changelog based off the PR description and changed terraform-docs output
• Removes repo-level semantic-release versioning + the requirement to use semantic commit messages/PR titles