Create a type-specific typanalyze routine for tsvector, which collects stats

on the most common individual lexemes in place of the mostly-useless default
behavior of counting duplicate tsvectors.  Future work: create selectivity
estimation functions that actually do something with these stats.

(Some other things we ought to look at doing: using the Lossy Counting
algorithm in compute_minimal_stats, and using the element-counting idea for
stats on regular arrays.)

Jan Urbanski

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