Add gegis settings

[davide-f]

Closes #991

Changes proposed in this Pull Request

Introduction of a preliminary implementation of the gegis flexible usage

Checklist

• [x] I consent to the release of this PR's code under the AGPLv3 license and non-code contributions under CC0-1.0 and CC-BY-4.0.
• [ ] I tested my contribution locally and it seems to work fine.
• [ ] Code and workflow changes are sufficiently documented.
• [ ] Newly introduced dependencies are added to envs/environment.yaml and doc/requirements.txt.
• [ ] Changes in configuration options are added in all of config.default.yaml and config.tutorial.yaml.
• [ ] Add a test config or line additions to test/ (note tests are changing the config.tutorial.yaml)
• [ ] Changes in configuration options are also documented in doc/configtables/*.csv and line references are adjusted in doc/configuration.rst and doc/tutorial.rst.
• [x] A note for the release notes doc/release_notes.rst is amended in the format of previous release notes, including reference to the requested PR.

[davide-f]

@ekatef when you have time, it would be great your review here :)

[ekatef]

Hello @davide-f! A very nice improvement :) Have added a couple of minor comments. What do you think?

[davide-f]

Hello @davide-f! A very nice improvement :) Have added a couple of minor comments. What do you think?

Thanks :) Revised as suggested. Let's wait for the CI. I've added also the revision of the old osm_config file name.

[ekatef]

Hello @davide-f! A very nice improvement :) Have added a couple of minor comments. What do you think?

Thanks :) Revised as suggested. Let's wait for the CI. I've added also the revision of the old osm_config file name.

Looks great! :D

[davide-f]

Many thanks :) merging