ClientContext should be a type, not String

[ktoso]

Expected behavior

The ClientContext is often of well known shape:

It should handle the typing more gracefully I think, see docs:
https://docs.aws.amazon.com/lambda/latest/dg/nodejs-context.html

See also: #167 (comment) for discussion on this

Actual behavior

It's a String today:

            let clientContext: String?

[sebsto]

Still valid for v2

[sebsto]

Here is the Rust documentation https://docs.aws.amazon.com/lambda/latest/dg/rust-context.html and implementation https://github.com/awslabs/aws-lambda-rust-runtime/blob/baf3653402930d74500dde0e8a2d2264407d3f4f/lambda-runtime/src/types.rs#L16

[sebsto]

v2 : line to change

swift-aws-lambda-runtime/Sources/AWSLambdaRuntime/LambdaContext.swift

Line 30 in 36dadf9

let clientContext: String?

[sebsto]

Fixed by #539

[sebsto]

merged