Add AWS Lambda integration guide (#10278)
## Summary
This includes instructions to:
- Deploy a standalone application.
- Deploy an application that depends on local libraries (a workspace).
- Deploy via Docker.
- Deploy via zip.
There's an accompanying Git repository here:
https://github.com/astral-sh/uv-aws-lambda-example.
Closes https://github.com/astral-sh/uv/issues/8935.
