Return id(s) when calling Index::addItem and Index::addItems in Java bindings #494

Job	Run time
Run benchmarks on ubuntu-latest	34s
Build JAR with on ubuntu-latest	2m 37s
Lint Java	14s
Build JAR with on windows-latest	2m 30s
Lint C++	18s
Build JAR with on macos-12	1s
Test C++ on ubuntu-latest	3m 59s
Test C++ on windows-latest	1m 40s
Test with Java 11 on ubuntu-latest	2m 29s
Test with Python 3.8 on ubuntu-latest	2m 29s
Test with Java ${{ matrix.java-version }} + Address Sanitizer	0s
Test C++ on macos-12	1s
Test with Java 17 on ubuntu-latest	2m 43s
Test with Python 3.8 on windows-latest	3m 53s
Test with Java 11 on windows-latest	2m 35s
Test with Python 3.8 on macos-12	1s
Test with Java 17 on windows-latest	3m 20s
Test with Python 3.8 + Address Sanitizer	2m 58s
Test with Java 11 on macos-12	1s
Test with Java 17 on macos-12	1s
Combine JARs	0s
Upload to Maven Central	0s
Build wheel for ${{ matrix.build }}	1s
Upload wheels to PyPI	1s
	32m 26s

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