range interface

[yannick]

create a range based interface to read/write data in a streaming way.

[9il]

This is not possible for text based formats to write in lazy streaming way because the upload data header must have the data size

[yannick]

the range abstractions needs to be initialized with a buffer and buffer sized chunks need to be uploaded. and it additionaly needs a .finish() or similar method (that is called in the destructor too) to upload the data left in the buffer

the download range should be random access via Range headers