Add state for transmission time

[Schmakus]

Is your feature request related to a problem? Please describe.
there's no extra state for transmission time, only available with command

Describe the solution you'd like
extra state for transmission time, like the other adapters (deconz, zigbee, shelly,...)

node-hue-api:
to set in ms:
transition() The transition(value) function will set the duration of any transition from the lights current stat to a new state in milliseconds. value: The value in milliseconds for the transition, e.g. 4000 for 4000ms

to get:
[ "on", "bri", "hue", "sat", "effect", "xy", "ct", "alert", "colormode", "mode", "reachable", "transitiontime", "bri_inc", "sat_inc", "hue_inc", "ct_inc", "xy_inc" ]

transitiontime() The transitiontime(value) will set the duration of any transition from the lights current state to the new state. value: An integer value as a multiple of 100ms, e.g. 4 corresponds to 400ms and 10 to 1 second.

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Additional context
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[Schmakus]

revers to #266. I'm working on it,