refactor greptimedb bridge (split to actions and connectors)

[SergeTupchiy]

Fixes EMQX-11457

Release version: v/e5.?

Summary

PR Checklist

Please convert it to a draft if any of the following conditions are not met. Reviewers may skip over until all the items are checked:

• Added tests for the changes
• Added property-based tests for code which performs user input validation
• Changed lines covered in coverage report
• Change log has been added to changes/(ce|ee)/(feat|perf|fix|breaking)-<PR-id>.en.md files
• For internal contributor: there is a jira ticket to track this change
• Created PR to emqx-docs if documentation update is required, or link to a follow-up jira ticket
• Schema changes are backward compatible

Checklist for CI (.github/workflows) changes

• If changed package build workflow, pass this action (manual trigger)
• Change log has been added to changes/ dir for user-facing artifacts update

[thalesmg]

✔️
LGTM.
We just need to update the dependency ref once the PR is merged (or use our fork if that takes too long).

[SergeTupchiy]

Thanks @thalesmg. Greptime team approved my PR and tagged the new release, so I've already removed my fork from rebar/mix deps.