Add datasets for timeseries: industry heat demand med/high and heatpump cop med

[SabineHaas]

Adds datasets and raw data template for

• industry heat demand timeseries (heat_med/heat_high)
• heatpump cop timeseries (heat_med)

Currently the data preprocessing is outside the pipeline. #29
Documentation follows. #28

Before merging into dev-branch, please make sure that the following points are checked:

• All pre-commit tests passed locally with: pre-commit run -a
• File CHANGELOG.md was updated
• The docs were updated
  • if dataset.mds were updated, the dataset docs were regenerated using
    python docs/generate_dataset_mds.py

If packages were modified:

• File poetry.lock was updated with: poetry lock
• A new env was successfully set up

WARNING: When modifying use snakemake <=7.32.0, cf. #186

If data flow was adjusted:

• Data pipeline run finished successfully with: snakemake -jX

• Esys appdata was created successfully with: snakemake -jX make_esys_appdata

  (with X = desired number of cores, e.g. 1)