feat: create gha workflow & action to run syncweaver update

[kelly-sovacool]

Changes

New composite action & workflow to run syncweaver update on repository_dispatch. Use case: when a source repo cuts a new release, it could trigger the workflow to run in host repos that depend on it.

Issues

PR Checklist

(Strikethrough any points that are not applicable.)

• This comment contains a description of changes with justifications, with any relevant issues linked.
• Write unit tests for any new features, bug fixes, or other code changes.
• Update docs if there are any API changes.
• Update CHANGELOG.md with a short description of any user-facing changes and reference the PR number. Guidelines: https://keepachangelog.com/en/1.1.0/

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