Re-test varint writing performance

[anthony-swirldslabs]

See #788 (comment)

Copying here:
Re-running some writing benches:

• com.hedera.pbj.integration.jmh.varint.VarInt32SizeOfBench - https://github.com/hashgraph/pbj/actions/runs/26786558765/job/78963600312
• com.hedera.pbj.integration.jmh.varint.VarInt64SizeOfBench - https://github.com/hashgraph/pbj/actions/runs/26786621669/job/78963798315
• com.hedera.pbj.integration.jmh.varint.VarIntWriterBench - https://github.com/hashgraph/pbj/actions/runs/26786674935/job/78963964610

[anthony-swirldslabs]

Bench results:

Benchmark                          (numOfBytes)  Mode  Cnt  Score   Error  Units
VarInt32SizeOfBench.google                    1  avgt    4  0.456 ± 0.009  ns/op
VarInt32SizeOfBench.google                    2  avgt    4  0.456 ± 0.001  ns/op
VarInt32SizeOfBench.google                    4  avgt    4  0.455 ± 0.003  ns/op
VarInt32SizeOfBench.kafka                     1  avgt    4  0.588 ± 0.002  ns/op
VarInt32SizeOfBench.kafka                     2  avgt    4  0.588 ± 0.003  ns/op
VarInt32SizeOfBench.kafka                     4  avgt    4  0.588 ± 0.004  ns/op
VarInt32SizeOfBench.pbjProtoTools             1  avgt    4  0.178 ± 0.007  ns/op
VarInt32SizeOfBench.pbjProtoTools             2  avgt    4  0.486 ± 0.004  ns/op
VarInt32SizeOfBench.pbjProtoTools             4  avgt    4  0.485 ± 0.001  ns/op

Benchmark                          (numOfBytes)  Mode  Cnt  Score   Error  Units
VarInt64SizeOfBench.google                    1  avgt    4  0.368 ± 0.003  ns/op
VarInt64SizeOfBench.google                    2  avgt    4  0.366 ± 0.009  ns/op
VarInt64SizeOfBench.google                    4  avgt    4  0.366 ± 0.003  ns/op
VarInt64SizeOfBench.google                    8  avgt    4  0.365 ± 0.010  ns/op
VarInt64SizeOfBench.kafka                     1  avgt    4  0.761 ± 0.021  ns/op
VarInt64SizeOfBench.kafka                     2  avgt    4  0.759 ± 0.002  ns/op
VarInt64SizeOfBench.kafka                     4  avgt    4  0.760 ± 0.015  ns/op
VarInt64SizeOfBench.kafka                     8  avgt    4  0.759 ± 0.004  ns/op
VarInt64SizeOfBench.pbjProtoTools             1  avgt    4  0.140 ± 0.017  ns/op
VarInt64SizeOfBench.pbjProtoTools             2  avgt    4  0.456 ± 0.003  ns/op
VarInt64SizeOfBench.pbjProtoTools             4  avgt    4  0.456 ± 0.002  ns/op
VarInt64SizeOfBench.pbjProtoTools             8  avgt    4  0.456 ± 0.005  ns/op

Benchmark                                      (numOfBytes)  Mode  Cnt   Score   Error  Units
VarIntWriterBench.googleCodedByteArray                    4  avgt    5   3.649 ± 0.031  ns/op
VarIntWriterBench.googleCodedByteBufferDirect             4  avgt    5   4.161 ± 0.018  ns/op
VarIntWriterBench.googleCodedOutputStream                 4  avgt    5   3.682 ± 0.005  ns/op
VarIntWriterBench.kafkaByteBuffer                         4  avgt    5   4.018 ± 0.056  ns/op
VarIntWriterBench.pbjBufferedData                         4  avgt    5   4.632 ± 0.071  ns/op
VarIntWriterBench.pbjBufferedDataDirect                   4  avgt    5   4.121 ± 0.039  ns/op
VarIntWriterBench.pbjWritableStreamingData                4  avgt    5  20.439 ± 0.113  ns/op
VarIntWriterBench.richardStartinByteArray                 4  avgt    5   1.464 ± 0.003  ns/op

[anthony-swirldslabs]

Results above approximately match the results obtained one year ago at #618