Two handy extensions to work with HTTPClientResponse body

[makoni]

Two extensions for HTTPClientResponse to avoid boilerplate code.

Reading a response data currently:

let expectedBytes = headers.first(name: "content-length").flatMap(Int.init) ?? 1024 * 1024
var bytes = try await body.collect(upTo: expectedBytes)
if let data = bytes.readData(length: bytes.readableBytes) {
    // handle data
}

With the extension:

if let data = try await response.data(upTo: 1024*1024) {
    // handle data
}

Additionally an extension for bytes. Currently:

let expectedBytes = headers.first(name: "content-length").flatMap(Int.init) ?? 1024 * 1024
var bytes = try await body.collect(upTo: expectedBytes)

With the extension:

var bytes = try await response.bytes(upTo: 1024*1024)