fix: plumb outputStorageStrategy through conversation transformer to handler

Problem

The default lambda handler deployed for conversation routes via ai-constructs doesn't stream function logs for sandbox deployments when using the --stream-function-logs flag (documentation).

Description of changes

Plumb outputStorageStrategy from AmplifyGraphqlApi through the ConversationTransformer to ai-constructs.

This allows ai-constructs to include the conversation handler Lambda function in the root stack outputs for streaming.

[!NOTE] https://github.com/aws-amplify/amplify-category-api/pull/3014 contains an alternative approach that also works, but involves duplicating the types into amplify-graphql-transformer-interfaces.

Relevant Backend PR

https://github.com/aws-amplify/amplify-backend/pull/2073

CDK / CloudFormation Parameters Changed

N/A

Issue #, if available

N/A

Description of how you validated changes

Manually tested. E2E test not feasible as construct only test; will look into options for automated testing in a follow up.

> npx ampx sandbox --identifier 'logs' --stream-function-logs
[Sandbox] Watching for file changes...
File written: amplify_outputs.json
# Send a message
[AssistantChatDefaultConversationHandler] 1:24:17 PM {"time":"2024-11-12T18:24:17.783Z","type":"platform.initStart","record":{"initializationType":"on-demand","phase":"init","runtimeVersion":"nodejs:18.v49","runtimeVersionArn":"arn:aws:lambda:us-east-1::runtime:13821268cdb8b1fd3647b6b7f047e6989fdfa500ddcef1d207cab3e8aa30c617","functionName":"amplify-aismoketest-logs--AssistantChatDefaultConv-UxEQSg3XTyhZ","functionVersion":"$LATEST"}}
[AssistantChatDefaultConversationHandler] 1:24:18 PM {"time":"2024-11-12T18:24:18.153Z","type":"platform.start","record":{"requestId":"a9007650-3fad-4370-990c-db6646476e8e","version":"$LATEST"}}
[AssistantChatDefaultConversationHandler] 1:24:18 PM {"timestamp":"2024-11-12T18:24:18.154Z","level":"INFO","requestId":"a9007650-3fad-4370-990c-db6646476e8e","message":"Handling conversation turn event, currentMessageId=cd831839-7a3e-42fb-8a45-eb302c33a5ca, conversationId=21c3ec83-c701-4ae9-8b7a-386e36f346b2"}
[AssistantChatDefaultConversationHandler] 1:24:18 PM {"timestamp":"2024-11-12T18:24:18.605Z","level":"INFO","requestId":"a9007650-3fad-4370-990c-db6646476e8e","message":"Sending Bedrock Converse Stream request"}
[AssistantChatDefaultConversationHandler] 1:24:18 PM {"timestamp":"2024-11-12T18:24:18.868Z","level":"INFO","requestId":"a9007650-3fad-4370-990c-db6646476e8e","message":"Received Bedrock Converse Stream response, requestId=a74da7bf-8f48-497d-8977-930d7f1a709b"}
[AssistantChatDefaultConversationHandler] 1:24:24 PM {"timestamp":"2024-11-12T18:24:24.254Z","level":"INFO","requestId":"a9007650-3fad-4370-990c-db6646476e8e","message":"Conversation turn event handled successfully, currentMessageId=cd831839-7a3e-42fb-8a45-eb302c33a5ca, conversationId=21c3ec83-c701-4ae9-8b7a-386e36f346b2"}
[AssistantChatDefaultConversationHandler] 1:24:24 PM {"time":"2024-11-12T18:24:24.257Z","type":"platform.report","record":{"requestId":"a9007650-3fad-4370-990c-db6646476e8e","metrics":{"durationMs":6104.742,"billedDurationMs":6105,"memorySizeMB":512,"maxMemoryUsedMB":124,"initDurationMs":368.411},"status":"success"}}

Checklist

[x] PR description included
[x] yarn test passes
[ ] ~E2E test run linked~
[ ] ~Tests are changed or added~
[ ] ~Relevant documentation is changed or added (and PR referenced)~
[ ] ~New AWS SDK calls or CloudFormation actions have been added to relevant test and service IAM policies~
[ ] ~Any CDK or CloudFormation parameter changes are called out explicitly~

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

aws-amplify / amplify-category-api