Attribute decorators

Created by: stanislaw55

Hi, according to docs, it's currently possible to have syntax like this

class PowerSupply(Device):
    def init_device(self):
        Device.init_device(self)
        self._current = -1

    @attribute(label="Current", unit="mA", dtype=int)
    def current(self):
        return self._current

    @current.write
    def current(self, current):
        self._current = current

what about extending attribute class to have syntax like this

class DecoratorTest(Device):
    def init_device(self):
        Device.init_device(self)
        self._current = -1

    current = attribute(label="Current", unit="mA", dtype=int)

    @current.getter
    def cur_read(self):
        return self._current

    @current.write
    def cur_write(self, current):
        self._current = current

    @current.is_allowed
    def cur_allo(self, req_type):
        return True