*: Use golang.time universally
After 9c260fde (time: New package that mirrors Go's time) we have golang.time.now and golang.time.sleep and it makes it a more self-dependent system if timing facility is used through golang.time instead of outside std time module. For now this is only a "cleanness" change, but will become important once we start adding pyx-level nogil API to pygolang - there it will be important to use golang.time.* for correctness.
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