feat: add support for queryDeduplication apollo config option

[rebeccarich]

Adds support for setting queryDeduplication: true|false on the ApolloClient instance as documented here.

Defaults to true inline with the Apollo Client default.

export default defineNuxtConfig({
  modules: ['@nuxtjs/apollo'],
  apollo: {
    queryDeduplication: true,
 	...
  }
})

It is useful to turn off queryDeduplication when you are relying on headers to differentiate between requests since this will not be recognised as a new query by Apollo Client.

Thanks for all your work on this module!

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