Mongo storage

[Olegt0rr]

Description

Added Mongo storage support based on aiomongo

[Birdi7]

Last commit is 2 year ago at aiomongo. Is this fine?

[JrooTJunior]

Is Motor has the same interface? Maybe this storage can be maked more universally for usage with different drivers. Or maybe can be splitted into different storages like MotorsMongoStorage and AioMongoStorage.

Because Motor looks more reliable

[Olegt0rr]

Last commit is 2 year ago at aiomongo. Is this fine?

Not aiomongo works fine and it's enought for me.
I'm not sure about motor speed. 2 years ago aiomongo was more faster than motor (look at the benchmarks).

If you can make fresh comparison of motor and aiomongo - please, do it.

[JrooTJunior]

I'll merge this PR but after that i rename module from mongo to aiomongo and after that add the motor version of this storage because Motor is official library and is more popular