Improve performance of parsing unknown fields in Java (#9371)

Credit should go to @elharo for most of these Java changes--I am just cherry-picking them from our internal codebase. The one thing I did change was to give the UTF-8 validation tests their own Bazel test target. This makes it possible to give the other tests a shorter timeout, which is important for UnknownFieldSetPerformanceTest in particular.
protocolbuffers · Jan 5, 2022 · f554cca · f554cca
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commit f554cca
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diff --git a/Makefile.am b/Makefile.am
@@ -490,6 +490,7 @@ java_EXTRA_DIST=
   java/core/src/test/java/com/google/protobuf/TypeRegistryTest.java                \
   java/core/src/test/java/com/google/protobuf/UnknownEnumValueTest.java            \
   java/core/src/test/java/com/google/protobuf/UnknownFieldSetTest.java             \
+  java/core/src/test/java/com/google/protobuf/UnknownFieldSetPerformanceTest.java             \
   java/core/src/test/java/com/google/protobuf/UnmodifiableLazyStringListTest.java  \
   java/core/src/test/java/com/google/protobuf/Utf8Test.java                        \
   java/core/src/test/java/com/google/protobuf/Utf8Utils.java                       \