Change cache in MetricTimeQueryValidationRule
to LruCache
#1457
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Missed this earlier, but
MetricTimeQueryValidationRule
holds a reference toSemanticModelLookup
/MetricLookup
indirectly because it holds a reference toSemanticManifestLookup
. Since those objects can be large, this PR changes the cache inMetricTimeQueryValidationRule
toLruCache
so that those objects are garbage-collected properly.