Add more ordering options

[karolina-siemieniuk-morawska]

We should have the same ordering options as in old Holdingpen:

• best match
• relevance prediction (asc)
• relevance prediction (desc)

[drjova]

TECH NOTES: We only need to add the following for the moment:

• bestmatch is based on the _score field on OpenSearch, double check with documentation of opensearch

NOTE:

• relevance is no applicable yet, because it's related to classifier and hep data.

[DonHaul]

Configuration of next as a reference: This is the configuration of next https://github.com/inspirehep/inspire-next/blob/d20c905fe9c0859749b490278b2549a561c2cb86/inspirehep/config.py#L1385-L1425