Feat: Implement default sleep detection

[Asanto32]

Resolves #40 Adds the SleepDetection class to analytics.py, this function runs the default GGIR sleep detection algorithm and returns an instance of the SleepWindow data class that contains a list of the onset-wakeup time pairs for each SleepWindow.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 97.80220% with 2 lines in your changes missing coverage. Please review.

Project coverage is 99.11%. Comparing base (d4ab484) to head (3f7be33).

Files	Patch %	Lines
src/wristpy/processing/analytics.py	97.80%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## development #57 +/- ## =============================================== - Coverage 100.00% 99.11% -0.89% =============================================== Files 4 5 +1 Lines 134 225 +91 =============================================== + Hits 134 223 +89 - Misses 0 2 +2 ```

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