Changes proposed in this Pull Request

Good day. This PR aims to integrate new H2 production technologies into the model. Technologies that are being add are: alkaline electrolyzer, PEM electrolyzer, SOEC electrolyzer, natural gas steam reforming (with/without CC), coal gasification (with/without CC), solid biomass steam reforming, solid biomass gasification (with/without CC), and heavy oil partial oxidation technologies.

In addition, currently existing H2 production technologies, such as H2 Electrolysis, SMR, and SMR CC, are re-organized and placed to add_hydrogen function of prepare_sector_network.py. Moreover, all H2 production technologies are grouped and listed in config file in a single place:

hydrogen:
    production:
        h2_electrolyzer: true
        SMR: true
        ....

Checklist

• 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.
• 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.