Add postgis plugin with support for JTS data types

[bchapuis]

This PR adds support for postgis and map geospatial data types to JTS data types.

As this is my first contribution to JDBI, I would love to get feedbacks:

• Does the plugin fits in the postgres module or should I create a new postgis module?
• Should the factory and mapper class be moved at the level of the package?
• How to test postgis without testcontainers as the setup is slighly different from postgres?
• Anything else that raises eyebrows.

Thanks a lot for maintaining JDBI.

[hgschmie]

Hi @bchapuis !

Thank you for contributing to JDBI! Your code is generally sound but you did a lot of work that was not necessary. :-)

I cleaned up the code in #2074 (and also made the test work and pass with our normal test framework). Please review and let me know if that works for your use case.

[bchapuis]

@hgschmie Thanks a lot for your feedback, it simplifies things a lot! Do you mind if we merge this PR instead of #2074? I cherry picked your changes, added you as a co-author and force pushed. I'd prefer to appear in the commit history than in the git comment. ;)

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

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[hgschmie]

merged as #2074