Export main adapters from module root index

[yumauri]

Improve PR #36 further:

Instead of

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 })

it is possible to write

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

// ...

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

⚠️ Note though, that tree shaking will work only with ES modules