feat(java): optional MessagePack serializer

[pratyush618]

What

Adds MsgpackSerializer — a compact binary Serializer backed by Jackson's MessagePack dataformat. JSON stays the default; msgpack is opt-in per queue/task.

• MsgpackSerializer (org.byteveda.taskito.serialization) — wraps ObjectMapper(new MessagePackFactory()); implements the full Serializer SPI (serialize, deserialize(byte[], Class), deserialize(byte[], Type) for generics). Ctor overload accepts a preconfigured mapper.
• Dependency org.msgpack:jackson-dataformat-msgpack is compileOnly — compiled against, not bundled in the fat JAR or GraalVM path. A consumer selecting this serializer adds the dependency to their own build. Keeps the default distribution lean and the optional peer dep out of the native-image path.

Test

MsgpackSerializerTest — round-trips scalars, collections, and generic types; asserts msgpack output differs from JSON (compact binary). testImplementation pulls the dep for the test classpath.

./gradlew build green (JDK 17 build leg + 21/25 test legs).

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Review details

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Configuration used: defaults

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📥 Commits

Reviewing files that changed from the base of the PR and between 270f856 and 24a0fca.

📒 Files selected for processing (3)

• sdks/java/build.gradle.kts
• sdks/java/src/main/java/org/byteveda/taskito/serialization/MsgpackSerializer.java
• sdks/java/src/test/java/org/byteveda/taskito/MsgpackSerializerTest.java

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/java-msgpack

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