Added support for debounce and throttle in ApolloQuery component

[Liinkiing]

I found that debounce and throttle were not presend in the ApolloQuery component. I think that they fit perfectly in the component. Maybe it was by design, if so, could it be integrated in the component?

I'm new into submitting PR in this project, so I don't know if they are some steps required, but I hope it would be useful ! And I could not find development procedures, so I hope that I have not forgotten something !

This PR will allow us to use debounce and throttle like this

<input type="text" v-model="name">
<ApolloQuery :debounce="600" :query="require('...')" :variables="{ name }">
      <template slot-scope="{ result: { data, loading, error } }">
         ...
      </template>
</ApolloQuery>

where name is a v-model, so when it is changed in the input, it will not refetch the query when the input has changed, but it will be debounced! Throttle would work the same way, just add it as a props!

[Psyker]

It could be very useful !

[nathanwaters]

Does debounce and throttle work inside this.$apollo.mutate()? Doesn't seem to for me