feat:added a postgres version check

[CommanderStorm]

• adds a postgres version check
• added a testcase (using testcontainers) that the version is parsed correctly

Resolves #1230 (I think at this point the PR can be considered unasigned again, feel free to reject otherwise. Don't want to step on peoples toes ^^)
Resolves #1229 (by using the minumum supported postgres version for postgis)

[nyurik]

thanks! test containers is an interesting feature, perhaps should use it in some other places too.

[CommanderStorm]

Bit of an overlooked downside:
since it requires docker, the CI runners for Mac/windows would need to install this manually, but otherwise a really great tool for testing, can only recommend..