updated biochar logic as CDR technology

[BertoGBG]

Closes # (if applicable).

Changes proposed in this Pull Request

update of the biochar pyrolysis with in compile_cost_assumption.py. chage of basis for units and additional paramaters are calcualted as biochar pyrolysis is not considered as CDR technology

Checklist

• [Y] Code changes are sufficiently documented; i.e. new functions contain docstrings and further explanations may be given in doc.
• [Y] Data source for new technologies is clearly stated.
• Newly introduced dependencies are added to environment.yaml (if applicable).
• A note for the release notes doc/release_notes.rst of the upcoming release is included.
• [Y ] I consent to the release of this PR's code under the GPLv3 license.