Fixes for transmission

[ka-sarthak]

• Uses an updated version of transmission (from AreaA repo) plugin.

• Overwrites the definition of results and settings rather than using m_copy

• Adds an IKZ-specific parser for .asc that uses IKZ-specific ELN

• Extends write_transmission_data method to include specialized behavior

• Adds IKZCategory to the specialized schema

• Adds tests for parsing of transmission files

• It allows a more modular way to specializing the schemas for IKZ. write_transmission_data has been simplified by abstracting out composition of the sub-sections into a separate method compose_subsections. In a specialized ELN class, one has to simply override compose_subsections to use IKZ specific results and settings. Then, write_transmission_data can also be extended to add more data into the transmission section.

• Add specialized write_transmission_data and compose_subsections methods

[ka-sarthak]

This is connected to the changes made here FAIRmat-NFDI/AreaA-data_modeling_and_schemas#206

[hampusnasstrom]

Not tested but looks good