[Feature]: Java Workflow Insight plugin follow-up work

[wangyb-A]

What would you like?

Track work deferred from the initial Java Workflow Insight plugin pull request,
#661.

Follow-up items

• Move ON_CHANGE exports off the checkpoint callback thread, add bounded
  coalescing, and prevent a delayed RUNNING export from overwriting the
  terminal object.
  (comment)
• Preserve Java runtime types when passing values to content transforms.
  (comment)
• Guarantee that records satisfy the configured size limit after all
  truncation phases. (comment)
• Distinguish an included JSON null value from an omitted or disabled field.
  (comment)
• Complete exporter isolation for enum values and mutable map keys.
  (comment)
• Coordinate sampling normalization across JavaScript, Python, and Java;
  Java should continue matching JavaScript until then.
  (comment)
• Cloud base integration test
• Skip input snapshotting when input collection is disabled
  (content.input(false)); cache explicit absence without serializing the value.
  (comment)
• Validate required exporter configuration, including a non-blank destination
  and positive record-size limit, at build time for S3, CloudWatch Logs, and
  Lambda log exporters.
  (comment)

Missing exporters

Java already has Lambda logs, CloudWatch Logs, and S3. Add the remaining
exporters available in the JavaScript plugin:

• CloudWatchLogsExporter
• DynamoDBExporter
• FirehoseExporter
• EventBridgeExporter
• SQSExporter
• OTelExporter
• HttpExporter
• FileExporter
• OpenSearchExporter
• RedshiftExporter
• AuroraExporter

Links

• Java plugin PR:
  feat: add Workflow Insight plugin #661
• Python tracking issue:
  [Feature]: Add workflow insight plugin aws-durable-execution-sdk-python#687
• JavaScript reference:
  https://github.com/aws/aws-durable-execution-sdk-js/tree/main/packages/aws-durable-execution-sdk-js-insight