Add support for creating WebSocket clients to the uws bindings

[rdw-software]

One of the uws examples suggests the library also supports creating WebSocket clients. While it isn't super useful and webviews can also create WebSockets, it may be worth looking into adding support for this directly, if only to make testing easier. It seems that there's no C API for this currently (or maybe I couldn't find it)? If so, extra glue code would have to be created in the C++ bindings.