test(conformance): plugin hook-info field-shape handlers (10-19..10-23)

[wangyb-A]

Summary

Adds 5 conformance handlers (conformance-tests/src/main/java/plugin/Plugin{InvocationInfo,OperationInfo,AttemptInfo,OperationChange,ContextInfo}Shape.java) plus 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, with null/unexposed fields OMITTED so a missing key fails its assertion. Real SDK APIs only, spotless-clean.

Stacked PR

Top of a 2-PR stack — base is the parity-fix branch, not main.

1. fix(plugin): surface missing state fields on hook info records #618 — SDK parity fix (plugin-hook-parity-fix), exposes the missing hook-info fields.
2. This PR — the handlers that assert them.

The dependency is real, not cosmetic: the final commit here dumps operations/updatedOperations, isReplay, attempt, executionInput, executionResult and the operation result, which only exist after the parity fix. Review the base PR first; merge it first.

Testing

Live plugin conformance suite (us-west-2), run against the full stack: 23 cases, 0 failures, 2 skipped — 21/21 covered, up from 18/21.

Requirement	Before parity fix	With stack
10-19 invocation-info shape	FAILED	PASSED
10-21 attempt-info shape	FAILED	PASSED
10-22 operation-change shape	FAILED	PASSED
10-20, 10-23	PASSED	PASSED
10-1..10-13, 10-15..10-17	PASSED	PASSED

The three prior failures were the deliberate parity signals these handlers exist to produce; the base PR resolves all three.

• ✅ 10-20 and 10-23 pass (incl. OperationInfo.status, subType tokens, and correct isReplayingChildren semantics), plus the entire mapped 10-1..10-17 regression.
• 10-14 and 10-18 report UNCOVERED because their handlers live on separate branches — expected, not a regression. The operation-result payload gap stays tracked by behavioral test 10-14 (Add plugin conformance case 10-14 (known SDK gap) #581), out of GA shape-suite scope.

One caveat on evidence: the runner asserts the ExpectedLogs field-presence probes against CloudWatch during the run and then deletes the stack, which takes the log groups with it. The passing assertions are the record; the raw emitted hook records were not retained as an artifact.

Closes #604