feat: Add instrumentation for Lambda Java interface HandleStreamRequest (#1036)

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.



By submitting this pull request, I confirm that my contribution is made
under the terms of the Apache 2.0 license.

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