[Feature Request] In-place namespaces

[nolde]

Would be nice to have "in-place" namespaces, similar to what happens with vuex mappers.

import { useGetters } from 'vuex-composition-helpers'

export default {
  setup() {
    const { one, two } = useGetters('my/long/name/space', ['one', 'two'])
    const { uno, dos } = useGetters('my/other/thing', ['uno', 'dos'])
    return { one, two, uno, dos }
  }
}

[davidmeirlevy]

@nolde as you can see in the source code, the global functions are passing null as a namespace to the useMapping function.

If you like to create an improvement that will pass the namespace to the global functions, you're welcome, just make sure all the tests will pass :)