Spectral-recovery

Added

- Add recovey_target_method parameter to RestorationArea (61).

Changed

- Refactor RestorationArea init method (61).
- Rename recovery_target module to target (61).
- Updated docstrings and notebooks.
- Refactor median target method into parameterized, callable class (61).

Removed

- Remove _ReferenceSystem class (61).

Added

- Add historic vs. reference target details in overview (47)
- Add corner case tests to Y2R (42)
- Fix typos in docstrings.

Fixed

- Fix incorrect Y2R values bug (42)

Added

- Support for Sentinel-2 imagery (21).
- Add optional param for naming bands (29).
- Add method for plotting RecoveryArea spectral trajectories (27)(30).
- Support for Red Edge and Coastal Aerosol bands (32).
- New Landsat annual composite test dataset with proper scaling and cropped to a smaller area.
- Support for computation using NumPy arrays (33).

Changed

- Update use guide to reflect new API usage.
- Update user guide to show users how to write results using rioxarray.
- Allow close-to-zero differences between image stack and restoration polygons (37).
- Change recovery target computation from mean to median (26).
- Allow string inputs instead of datetime objects (31).
- Lint the codebase (36).

Removed

- Temporarily remove tassel-cap indices ("TCW", "TCB", "TCG") (37).
- Remove old Landsat annual compsite test dataset used in documentation.

Fixed

- Fix incorrect NDII equation (37).
- Fix incorrect multi-dimensional median target (26)(28).