uloop: add support for tasks

Tasks are similar to processes but instead of executing a new process, an
ucode function is invoked instead, running independently of the main
process.

Example usage:

    uloop.init();

    let t = uloop.task(
    	// program function
    	function(pipe) {
    		let input = pipe.receive();

    		pipe.send({ got_input: input });

    		return { result: true };
    	},

    	// parent recv function, invoked when task function calls pipe.send()
    	function(res) {
    		printf("Received output message: %.J\n", res);
    	},

    	// parent send function, invoked when task function calls pipe.receive()
    	function() {
    		let input = { test: "Example" };

    		printf("Sending input message: %.J\n", input);

    		return input;
    	}
    );

    uloop.run();

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

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