The Maven Central search API) is very unreliable, it would be nice to have other options.

• Google https://docs.deps.dev/api/v3/ (test https://deps.dev/maven/org.codejive.jpm%3Ajpm)
• SMO https://github.com/apache/maven-indexer/tree/master/search-backend-smo
• RRB https://github.com/apache/maven-indexer/tree/master/search-backend-remoterepository
• There exists some internal undocumented CSC API , not sure it's a good idea trying to use that, though
• Others?

The idea would be to have an option to set the backend, simply --backend/-b or something?
With values like "google", "smo", "smo-csc".

And which would we make the default? "smo-csc" would probably be stable and up-to-date, but the Google one has really useful ordering, which the others lack. But it's not always the most up-to-date. Could we go crazy and search for artifacts using Google and then using smo-csc for versions?