Description

This PR replaces the Sphinx-based reStructuredText (RST) documentation generation system introduced in #418 with MkDocs and Markdown for AWS services only. It also updates the docstring format to use the Google style with Markdown descriptions fro all services (AWS and non-AWS).

Key changes:

• Updates all code generators (Client, Structure, Config, Enum, Union) to output Google style docstrings with Markdown descriptions using MarkdownConverter
• Adds pandoc CLI tool as a required build dependency to convert Smithy model documentation strings to Markdown for all services
• Adds AwsMkDocsFileGenerator plugin to generate MkDocs stub files for only AWS services in their docs/ directory
• Updates README with new pandoc dependency
• Adds MkDocs configuration file and python dependencies to AWS services
• Adds codegen utility function to determine if service is AWS or generic.
• Removes AwsRstDocFileGenerator plugin and RST-to-Markdown conversion logic

Testing

• Added unit tests and updated simple integration tests
• Generated aws-sdk-bedrock-runtime client and confirmed updates were functional
  • PR for updated client: Update Bedrock Runtime client to support Material for MkDocs awslabs/aws-sdk-python#24
• To see the live docs for aws-sdk-bedrock-runtime visit here

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