Add support protocol version 3.4

[2m0nd]

I bought new device with protocol 3.4, and i needed to add support new protocol in this library.

[2m0nd]

I used this implementation https://github.com/codetheweb/tuyapi/tree/master for understand new protocol.

[EgorTrutnev]

I checked the functionality on the Tuya v3.4 device. It is perfectly. Thank you

[AlhussienMohamedDotNet]

how much time can session key be used , i want to keep the connection open for long time but i couldn't .