Returns every taxonomic backbone taxify() can match against, its taxonomic
scope, and (once the manifest is reachable) its current version, name count,
download size, and whether it is already installed locally. The counterpart to
list_enrichments() for the backbone side.
Value
A data.frame with columns: name, scope, n_names, size_mb,
version, installed, source. n_names, size_mb, and version are
NA for any backbone the manifest does not yet describe or when the manifest
cannot be fetched offline.