Allow various Bands representations of Model Input Object

[fmigneault]

The MLM definition relies on STAC 1.1 Bands.
https://github.com/rbavery/dlm-extension/tree/validate?tab=readme-ov-file#bands-and-statistics

However, this definition is not yet part of the standard, and even less supported by the STAC tools/APIs/ecosystem.
radiantearth/stac-spec#1254

In the meantime, and to allow catalogs that want to remain in 1.0 version, the extension should also as alternative either the eo:bands or raster:bands. The pystac implementation could support all of them transparently. Probably raster:bands would be better than eo:bands, as it shares more required properties (dtype, nodata, etc.) that are needed by MLM.

[fmigneault]

Fixed by #2