Eotransform-xarray

- `NormalizeSig0ToRefLiaBySlope` uses and requires now orbit coordinates for the plia array stack and for the sig0 input, instead of attributes and dictionaries

- `NormalizeSig0ToRefLiaBySlope` adds now appropriate metadata to the
transformed array to be able to track sources and process of
normalization
- `NormalizeSig0ToRefLiaBySlope` requires now that LIA maps are
specified per orbit and inputs must provide their orbit to be able to
select the correct LIA map

- Provide NormalizeSig0ToRefLiaBySlope to normalize sig0 to a given reference angle

- Provide new `AggregateAlongDim` transformator for time series aggregation
- Provide pearsonr as an example

- allows using dask to scale resampling of raster data
- changes the optional processing protocol of the `ResampleWithGauss` transformer