Add home storage operation strategy

[birgits]

Description

This PR adds a storage operation strategy where the storage is charged, when PV feedin is higher than electricity demand of the household and discharged when electricity demand exceeds PV generation.

Type of change

• New feature (non-breaking change which adds functionality)

Checklist:

• New and adjusted code is formatted using the pre-commit hooks
• New and adjusted code includes type hinting now
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• The Read the Docs documentation is compiling correctly
• If new packages are needed, I added them the setup.py, and if needed the rtd_requirements.txt, the eDisGo_env.yml and the eDisGo_env_dev.yml.
• I have added new features to the corresponding whatsnew file