ben-manes / caffeine / #5437

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fix stats and Guava-compat issues found by detail.dev triage

- LocalCache.statsAware(BiFunction) catches Throwable to record load
  failures for sneaky-thrown checked exceptions in asMap compute/merge,
  matching the Function variant.
- CaffeinatedGuavaCache.AsMapView.get(null) returns null for Guava
  parity with LocalCache.asMap().
- CaffeinatedGuavaLoadingCache.ExternalBulkLoader.loadAll validates the
  returned map (null map / null values) so Guava users see the same
  InvalidCacheLoadException as the single-load path; null keys defer to
  Caffeine's own NPE in cache.put.
- LocalAsyncCache.AsyncBulkCompleter records loadFailure when the
  loader returns an empty (or filtered-to-empty) map, matching the sync
  path. The single-key analogy anchors the semantic: a load that did
  not produce a cacheable value is loadFailure, even when nothing
  exceptional was thrown.

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