Deno KV .listenQueue() should have different types

[kitsonk]

Version: Deno 1.39.1

Currently .listenQueue() is typed as the following:

    listenQueue(
      handler: (value: unknown) => Promise<void> | void,
    ): Promise<void>;

The problem is that when consuming the API, unknown becomes very restrictive. For example if you were to do something like this:

interface MyEvent {
  type: string;
}

const db = await Deno.openKv();
db.listenQueue((value: MyEvent) => {});

You would get the following error:

Argument of type '(value: MyEvent) => void' is not assignable to parameter of type '(value: unknown) => void | Promise<void>'.
  Types of parameters 'value' and 'value' are incompatible.
    Type 'unknown' is not assignable to type 'MyEvent'.

Which makes usage quite user hostile. For consumption of APIs where the value could be anything, it is better to use the top type any, which is what occurs in several instances in built in types where the value could be of any type.