add country specific technology costs

[Tomkourou]

Closes #756

Changes proposed in this Pull Request

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.

[Tomkourou]

Still work in progress but this PR applies technology costs at the country level. If country data is not available in the costs.csv it will look for continent level e.g. if "TH" is missing it will look for "Asia" and if "Asia" is missing it will apply global costs.

Once this is in good shape it will require to go upstream on technology_costs and add country specific data.

A good test to see if these changes are working as expected will be to test global costs on the tutorial (i.e. the same costs as we currently have) and check that they are all the same as before the changes were made.