feat: Add instrumentation for Lambda Java interface HandleStreamRequest

Problem:
All Lambda Java users using HandleStreamRequest experience broken application signal traces. This issue affects all Spring Boot 3 users.

Cause:
AWS Lambda for Java provides two handler interfaces:
com.amazonaws.services.lambda.runtime.RequestHandler
com.amazonaws.services.lambda.runtime.RequestStreamHandler
However, instrumentation for RequestStreamHandler is missing in the OpenTelemetry Java agent.

Fix:
Added instrumentation support for RequestStreamHandler.

Test:
Unit tests pass (./gradlew spotlessCheck assemble instrumentation:test).
Manual end-to-end tests pass:
Deployed Lambda functions with Spring Boot 3 and Amazon Serverless Java Container.
Enabled application signals, observed broken traces.
Disabled application signals and added a private build of the Java layer for Lambda with this change.
Verified traces and spans are now correct.

Backward Compatibility:
No risk of breaking existing functionality.
The change only adds instrumentation for RequestStreamHandler without modifying existing behavior for RequestHandler.
Existing users not using RequestStreamHandler remain unaffected.

Author: lukeina2z

lambda-layer/build-layer.sh

@@ -28,6 +28,8 @@ patch -p1 < "$SOURCEDIR"/../.github/patches/opentelemetry-java-instrumentation.p
 # This patch is for Lambda related context propagation
 patch -p1 < "$SOURCEDIR"/patches/opentelemetry-java-instrumentation.patch
 
+patch -p1 < "$SOURCEDIR"/patches/StreamHandlerInstrumentation.patch
+
 ./gradlew publishToMavenLocal
 popd
 rm -rf opentelemetry-java-instrumentation