Enable saving routing parameters in hbv_1_1p.py + Test in example/hydrology/dhbv_1_1p_zn_simu.ipynb

[ZhennanShi1]

Issue Addressed

Description

1. Adding following parameters in hbv1.1p class for supporting warm restart:

    self.routing_len = 15
    self.routing_state = None
    self._routing_state_cache = None
   

2. Modified the get_states() and save_states() in hbv1.1p class to support the routing information stored in pt files

3. save_states() and load_states() in ModleHanderler in dmg is modfied accordingly.

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Code cleanup/refactor
• Documentation update

Other (please specify):

Checklist

• Branch is up to date with master
• Updated tests or added new tests
• Tests & pre-commit hooks pass
• Updated documentation (if applicable)
• Code follows established style and conventions