Fix time handling in Splash

[tztsai]

Description

The update uses CalendarDay.days_in_year to find the number of days after a whole year in the estimate_initial_soil_moisture method of SplashModel. An additional check is also added in __init__ to ensure that the length of dates matches the shape of other variables.

Fixes #165

Type of change

• [x] Bug fix (non-breaking change which fixes an issue)

Key checklist

• [x] Make sure you've run the pre-commit checks: $ pre-commit run -a
• [x] All tests pass: $ poetry run pytest

Further checks

• [x] Code is commented, particularly in hard-to-understand areas
• [x] Tests added that prove fix is effective or that feature works

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 94.88%. Comparing base (8f7d032) to head (b4ec7c6).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #186 +/- ## ============================================ + Coverage 0 94.88% +94.88% ============================================ Files 0 28 +28 Lines 0 1505 +1505 ============================================ + Hits 0 1428 +1428 - Misses 0 77 +77 ```

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[davidorme]

I've resolved the pyproject.toml and poetry.lock conflict - just different package order in the pyproject.toml dev dependencies