factor out (public static) MultiCollector.scoreMode(Collector[]) method

[cpoerschke]

To allow re-use rather than duplication of the logic e.g. see https://github.com/apache/solr/pull/2248/commits/3cee3e591995520cdfed41a5228a2e01c3b5cc0f#r1485486388 thread.

[jpountz]

I'm not too familiar with the Solr code but I see that it duplicates logic in setScorer as well, could it reuse MultiCollector directly instead of exposing the method that combines score modes?

[cpoerschke]

... could it reuse MultiCollector directly instead of exposing the method that combines score modes?

I'd wondered the same-ish i.e. MultiCollectorManager re-use -- https://github.com/apache/solr/pull/2248/files#r1489857592 -- but so far don't see a way, perhaps just needs more looking at and into. @chatman or @dsmiley might also have more context or thoughts on this?

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