Refactor Document#createDocuments-like methods.

[LukeAbby]

Doing stuff like:

  static createDocuments<T extends Document.AnyConstructor, Temporary extends boolean | undefined>(
    this: T,
    data: Array<Document.ConstructorDataFor<NoInfer<T>>>,
    operation?: InexactPartial<
      Omit<Document.DatabaseOperationsFor<NoInfer<T>["metadata"]["name"], "create">, "data">
    > & {
      temporary?: Temporary;
    },
  ): Promise<Document.ToStoredIf<T, Temporary>[] | undefined>;

Is quite clever but it inhibits the ability to subclass it.
A more ideal situation would be one override per Document:

  static createDocuments<Temporary extends boolean | undefined>(
    data: Array<CurrentClass.ConstructorData>,
    operation?: InexactPartial<
      Omit<Document.DatabaseOperationsFor<"CurrentClass", "create">, "data">
    > & {
      temporary?: Temporary;
    },
  ): Promise<Document.StoredIf<CurrentClass, Temporary>[] | undefined>;