Update typed apollo provider

[joe-re]

Update type definition according to the below commit.
6650430

changes

• remove apolloProvider propery from ComponentOptions extended.
  • now use provide props provided by public.(ref: https://vuejs.org/v2/api/#provide-inject)
• add prefetch props to apollo query option.
• add below APIs to ApolloProvider(VueApollo default exported).
  • provide: (key?: string) => this
  • prefetchAll: (context: any, components: VueApolloComponent[], options?: { includeGlobal?: boolean }) => Promise<ApolloQueryResult[]>
  • getStates(options?: { exportNamespace?: string }): { [key: string]: any }
  • exportStates(oprions?: { globalName?: string, attachTo?: string, exportNamespace?: string}): string

[joe-re]

this file changes are just moved from vue-apollo.d.ts to be easy to read, but only add prefetch props.

[Akryum]

Awesome! 👍