ResolutionInfoProvider
interface ResolutionInfoProvider
If the type of resolution info is specified, i.e. lib@url[https://xyz.com/lib.json]
then the corresponding LibraryResolutionInfo is created. ResolutionInfoProvider isn't used in this case.
If it is not specified but still present, i.e. lib@https://xyz.com/lib.json
then get is used to guess and obtain correct LibraryResolutionInfo from the string after @
If nothing is specified, i.e. lib
then fallback is used. Implementations of get should consider returning fallback in case if string is empty.