Add separate adapters

[yumauri]

Sometimes it is required to persist different stores with different adapters within the same model (file). And to avoid names clashes you should write smth like this:

import { persist as localPersist } from 'effector-storage/local'
import { persist as queryPersist } from 'effector-storage/query'

// ...

localPersist({ store: $session })
queryPersist({ store: $page })

This PR adds exported adapters themselves to use with core persist function:

import { persist } from 'effector-storage'
import { local } from 'effector-storage/local'
import { query } from 'effector-storage/query'

// ...

persist({ adapter: local(), store: $session })
persist({ adapter: query(), store: $page })