feat(dh): apollo signal reset function

[ManBearTM]

This PR makes it possible to reset queries and mutations to an initial, pending state, essentially clearing the result fields. This can come in handy if, for example, you are using lazyQuery to do some validations in combination with computed:

validation = lazyQuery(GetUserByEmailDocument);

userExists = computed(() => this.validation.data()?.user ? true : false);

resetForm() {
  // This will cause `userExists` to be `false` again
  this.validation.reset();
}

async validate(email: string) {
  await validation.query({ variables: { email }});
}

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