feat: support all OtterWise CLI arguments

[Nighthawk14]

Summary

• Add 8 new inputs: org-token, mutation-file, log-file, quiet, fail-on-errors, flag, base-dir, endpoint
• Make token optional — either token or org-token must be provided
• Update README with full inputs table and usage examples

Test plan

• Verify action runs with token only
• Verify action runs with org-token only
• Verify action fails when neither token is provided
• Verify boolean flags (quiet, fail-on-errors) only append when true
• Verify string inputs only append when non-empty

🤖 Generated with Claude Code

[Nighthawk14]

Hello @LasseRafn 👋🏻 .

We were using the github action in our CI and we now need the flag argument to be passed to the CLI script. So rather than downloading it directly I thought about opening a PR here to support the other CLI flags.

Let me know what you think and can update.
Thanks!

[LasseRafn]

Hi @Nighthawk14 ! awesome addition, I will get this reviewed and merged right away. Much appreciated.

Please do bring any feedback on flags you might have as well as if you have any particular way you use it :)