Optimize script

[YuviGold]

Hey @teymour 👋
Great repo you have here, I searched for quite some time for a good solution for import & export of Metabase dashboards and encountered this repository which had the best results I could work with!

It's working really well, I made some adjustments during my usage :)

• Running loops in multithreaded, when having lots of fields (I had >10K) it's mandatory.
• Adding some known libraries for UX:
  • typer for CLI and argument parsing including env vars
  • rich for progress bar
• Adding some parsing tests for parsing conversions, that required some fixes:
  • Support targetId key
  • Fix id key that has a JSON value
  • Fix dashboard to dashboard links
• Improving usability
  • --verbose flag to increase output verbosity of each command
  • --dry-run flag run the script without making POST/PUT requests
  • --raw flag that stores the raw JSON without parsing it
• Improving repository maintenance
  • Adding pyproject.toml with poetry for dependency management
  • Adding linter and Makefile for known operations
  • Adding GHA that runs make lint and make test

I know these are lots of changes, but they really helped me using this repository. I hope you'll find them useful as well :)