Engine: fix negative pagination bounds and _ts accumulation

Two correctness bugs surfaced by CR / Phase 0, both inherited from
the bundled PhabricatorElasticFulltextStorageEngine pattern:

1. executeSearch() did not validate that $offset / $limit were
   non-negative. PHP's (int) cast on a negative string yields a
   negative int, which would be passed unchecked to Elasticsearch.
   Add an explicit non-negative check before the existing upper-
   bound (offset + limit > 10000) check.

2. reindexAbstractDocument()'s relationship-data loop assigned the
   '_ts' field unconditionally instead of accumulating. For multi-
   valued relationships (multiple authorPHID, projectPHID, etc.
   entries on the same doc), only the last timestamp survived.
   Change to array-append, parallel to the PHID array.

Both fixes diverge from the bundled engine; bundled retains the
faithful-but-broken behavior. Worth fixing in this extension since
we control the wire format.

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