ENH: STAC compliance about eoreader

[remi-braun]

Add ESA resolution category (VHR1/2, HR1/2, OTHER)

Not relevant as SAR sensor can acquire in several resolution categories

[remi-braun]

• Use this changes to create a band object overloading bands and index (no more wild functions/enum)

[remi-braun]

Create namedtuples for STAC extensions in the STAC attribute:

• prod.proj for proj extension with projected data (i.e. call the projected bbox like prod.proj.bbox)
• prod.view for view extension
• prod.cloud_cover for cloud cover from the eo extension
• Enrich the band_names attribute (change name to bands) with everything here

[remi-braun]

• In the band object, add the output radiometric processing aimed, either reflectance or brilliance temperature.

[remi-braun]

• Rather than changing all the function names, it would be better to have a stac object as an attribute implementing all needed functions, i.e.:

# BBOX / extent
eoreader_bbox = prod.extent()
stac_bbox_wgs84 = prod.stac.bbox()
stac_bbox_utm = prod.stac.proj.bbox()  # == prod.extent()

# Export (needs pystac)
stac_item = prod.stac.create_item() 

[remi-braun]

PR merged

[remi-braun]

⚠️ The view extension is partially filled.
Are missing:

• view:off_nadir
• view:incidence_angle
• view:azimuth