useResponseCache: invalidate cache all at once

[martin-cycle]

Is your feature request related to a problem? Please describe.

If you don't setup a ttl at first, you may endup with a never invalidated cache even after adding new cache restriction in the config.

Describe the solution you'd like

Some very basic solution using the inMemoryCache but we should be generalised (proposed by @EmrysMyrddin):

import { createInMemoryCache, Cache } from '@graphql-yoga/plugin-response-cache'

export function createCache(): Cache {
  let cache  = createInMemoryCache()
  return {
    get: (...args) => cache.get(...args),
    set: (...args) => cache.set(...args),
    invalidate: (...args) => cache.invalidate(...args),
    purge: () => {
      cache = createInMemoryCache()
    },
  }
}

Describe alternatives you've considered

A custom implementation

Additional context

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