Add hook-info field-shape conformance handlers

[wangyb-A]

Summary

Adds 5 conformance handlers (conformance-tests/src/main/java/plugin/Plugin{InvocationInfo,OperationInfo,AttemptInfo,OperationChange,ContextInfo}Shape.java) + template_plugin.yaml entries implementing plugin hook-info FIELD-SHAPE requirements 10-19..10-23 from aws/aws-durable-execution-conformance-tests#72 (land that PR first).

Each handler logs ONE single-line JSON record per hook event: a CANONICAL camelCase DUMP of that hook's own info record (null/unexposed fields OMITTED — a missing key fails its assertion). GA note: experimental payload fields (execution input/result, operation result) are dumped when exposed but not asserted. Spotless-clean; real SDK APIs only.

Live validation (us-west-2): 18/21 — THREE DELIBERATE FAILURES (SDK parity gaps, tracked in #604)

Req	Missing Java API surface
10-19	InvocationInfo has no operations/updated-operations maps; InvocationEndInfo additionally lacks the operations map and executionStartTime. (End-info isFirstInvocation and start-info executionStartTime PASS.)
10-21	UserFunctionStartInfo/EndInfo lack the operation-level isReplay indicator (only the distinct isReplayingChildren). Attempt timestamps PASS (ahead of JS).
10-22	OperationChangeItemInfo lacks attempt and a replay indicator.

• ✅ 10-20 and 10-23 pass (incl. OperationInfo.status, subType tokens, and correct isReplayingChildren semantics), plus the entire mapped 10-1..10-18 regression.
• The operation-result payload gap remains tracked separately by behavioral test 10-14 (Add plugin conformance case 10-14 (known SDK gap) #581), which is out of the GA shape-suite scope.