HTTPClient.Configuration.init parameter `redirectConfiguration` inconsistently named and suboptimal type

This is quite a minor issue but redirectConfiguration sticks out:

public init(tlsConfiguration: TLSConfiguration? = nil,
            redirectConfiguration: RedirectConfiguration? = nil,
            timeout: Timeout = Timeout(),
            proxy: Proxy? = nil,
            ignoreUncleanSSLShutdown: Bool = false,
            decompression: Decompression = .disabled) {

When I'm initialising a Configuration, I know that I'd be configuring the redirect configuration. I think it should be called redirects: or something similar.

Also, the type isn't great. It shouldn't be optional.

See Xcode's completion (which is accurate):

You'd expect that .none and .disallow are the same but .none secretly means "default" (which is not .disallow). The parameter should be non-optional and default to a new value .default.

We should deprecate this init and also fix the other optional ones.

Start by locating the HTTPClient.Configuration.init entry point and the RedirectConfiguration definition, then inspect call sites and existing tests for the current optional parameter behavior. Done means the redirect parameter naming and default value are corrected, the initializer is deprecated as requested, and the other optional initializers are addressed with coverage for the public API.