Add support for arrays

[ghivert]

What the PR does

• Add support for Arrays
• Add test cases for Arrays
• Reenables test on CI
  • CI instanciates PG
  • PG is running on local on the runner
  • Tests are run against the real PG installation
• Add a README to help running tests

Issues

• Closes #12

[lpil]

Could you rebase on main and update the changelog please?

[ghivert]

Sure! I don't have access to a computer right away, but count on me to do it asap!

[ghivert]

Done!