Reduce visibility of TaxonomyFacets and FloatTaxonomyFacets [LUCENE-10440]

[asfimport]

Similar to what we did in #11415, let's reduce the public visibility of TaxonomyFacets and FloatTaxonomyFacets to pkg-private since they're really implementation details housing common logic and not really intended as extension points for user faceting.

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Migrated from LUCENE-10440 by Greg Miller (@gsmiller), resolved Mar 01 2022
Pull requests: #712, #713

[asfimport]

Greg Miller (@gsmiller) (migrated from JIRA)

PRs posted for this. The only point maybe worth calling out here for discussion is that the visibility reduction of TaxonomyFacets means there is no common type to refer to just taxonomy-faceting implementations. The only reason I could see this maybe mattering is that TaxonomyFacets defines public methods childrenLoaded() and siblingsLoaded()}. So it's possible some user wants to refer to taxonomy facets generally, but not as general as just referencing Facets because they want to rely on one of these methods. This seems unlikely to me. The only code we have that references these methods is in testing, but I suppose users might want to know if these things were loaded for the purpose of metrics/logging/etc.

[asfimport]

ASF subversion and git services (migrated from JIRA)

Commit 4c9c1c0 in lucene's branch refs/heads/branch_9x from Greg Miller
https://gitbox.apache.org/repos/asf?p=lucene.git;h=4c9c1c0

LUCENE-10440: Mark TaxonomyFacets and FloatTaxonomyFacets as deprecated (#713)

[asfimport]

ASF subversion and git services (migrated from JIRA)

Commit 51797dc in lucene's branch refs/heads/main from Greg Miller
https://gitbox.apache.org/repos/asf?p=lucene.git;h=51797dc

LUCENE-10440: Reduce visibility of TaxonomyFacets and FloatTaxonomyFacets (#712)

[asfimport]

Adrien Grand (@jpountz) (migrated from JIRA)

Closing after the 9.1.0 release.