Consider making `aws_lambda_events::encodings::Body::Text` a `Cow<'static, str>`

This would reduce the amount of allocations needed when the body content is known at compile time

Start by locating aws_lambda_events::encodings::Body::Text and its usages in the repository. Check how compile-time body content is represented and how changing it to Cow<'static, str> would affect callers; done means the representation reduces unnecessary allocations without breaking existing behavior or builds.

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