Add support MTProto proxy

[alik0211]

[bitk0der]

At least socks5 proxy support, without "at system level". It's simple to add to this module just by using "socks" npm module (or code from it).

[orgalaf]

Hi, I need this too. Is it in the works? If not I'm probably gonna fork and add it. I'll PR it here if I succeed.

[alik0211]

Guys, please tell me why you need proxy support?

[Eonus21]

I for example wont to run multiply accounts using this api

[DricHao]

Guys, please tell me why you need proxy support?

One client multiple accounts, If we manage many accounts with same IP. Telegram official will ban our APPID. This is it.

[dmcslt]

伙计们，请告诉我为什么需要代理支持？

some countries block telegram

[MyZest]

伙计们，请告诉我为什么需要代理支持？

When will it be updated? I particularly need it and hope to get your help