Configuration changes to lambda processor and sink

[srikanthjg]

Description

Configuration changes to lambda processor and sink

Issues Resolved

Addresses #8655

Version

List the OpenSearch version to which this PR applies, e.g. 2.14, 2.12--2.14, or all.

Frontend features

If you're submitting documentation for an OpenSearch Dashboards feature, add a video that shows how a user will interact with the UI step by step. A voiceover is optional.

Checklist

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[vagimeli]

@srikanthjg We already have existing documentation on these topics. Of concern is the sink file. Please update the existing file instead of creating a new file. The published document is available at https://opensearch.org/docs/latest/data-prepper/pipelines/configuration/sinks/aws-lambda/. The file in the documentation-website repo is aws-lambda.md

[vagimeli]

The existing files should be updated. This content already exists and is published.