Assets keep their own `stac_extensions`#1256

Draft

constantinius wants to merge 2 commits intostac-utils:mainfrom constantinius:assets-extensions-no-owner

+111-36

Commits on Oct 8, 2023

Assets keep their own stac_extensions
constantinius
committed

Commits on Oct 12, 2023

Using _stac_extensions to denote non-standard field in assets
constantinius
committed