feat: simple distributed mode

[KnorpelSenf]

// bot.ts
import { Bot } from "https://deno.land/x/grammy@v1.13.1/mod.ts";
import { distribute, run } from "./mod.ts";

// Create bot
const bot = new Bot("token");

// Add the usual middleware, yada yada
bot.command("start", (ctx) => ctx.reply("Got your message."));
bot.use(distribute("./worker.ts"));

// Run it concurrently!
run(bot);

// worker.ts
import { BotWorker } from "./mod.ts";

const bot = new BotWorker("token");

bot.on("message", (ctx) => ctx.reply("yay!"));

Closes #6.

[KnorpelSenf]

Should probably add a protection against doing run(worker).

[KnorpelSenf]

Perhaps we should extract this into a separate plugin? That way, we could keep the runner free of deps