first draft of integration to be discussed:

1. reader to decode .xml files and reader .tiff -> returning a xarray datatree developed by Yann reynaud as xsar dependency
2. development of a intermediate layer to normalize the variable names from RS2 to mimic s1meta Class.
3. re-factorize some of the xsar.Sentinel1Dataset functions (such as rasterization functions) into a new sensor agnostic Class.