[WIP] Add tests

[paragor]

Add tests. Related: https://github.com/phuslu/nginx-ssl-fingerprint/issues/25

Progress:

• [x] Add simple smoke tests
• [ ] Add more ja3transport.Browser's (currently any browser except ja3transport.ChromeVersion103 trigger error, so need research)
• [ ] Add badges with nginx/openssl version compatibility in readme to solve https://github.com/phuslu/nginx-ssl-fingerprint/issues/27
• [ ] Speed up github actions:
  • [ ] need to reuse docker's image layer. i think cache at dockerhub can help)
  • [ ] use github actions matrix to run tests in parallel for different versions

[phuslu]

done with github actions. thanks anyway!