Expose some FacetContext and SlotAcc fields and classes to enable our…#43

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timatbw wants to merge 2 commits intoBrandwatchLtd:bw_branch_8_6_2from timatbw:bw_branch_8_6_2

+170-28

Commits on Nov 4, 2020

Expose some FacetContext and SlotAcc fields and classes to enable our custom aggregates to be moved into a plugin
timatbw
committed

Commits on Nov 6, 2020

Add test to confirm custom aggregates can be written outside the solr.search.facet package
timatbw
committed