Set enableTimestampEpoch by default

PiperOrigin-RevId: 886258398

Author: l46kok

common/src/main/java/dev/cel/common/CelOptions.java

@@ -177,6 +177,7 @@ public static Builder current() {
         .enableUnsignedComparisonAndArithmeticIsUnsigned(true)
         .enableUnsignedLongs(true)
         .enableRegexPartialMatch(true)
+        .enableTimestampEpoch(true)
         .errorOnDuplicateMapKeys(true)
         .evaluateCanonicalTypesToNativeValues(true)
         .errorOnIntWrap(true)