feat: allow users to define environment shape with zod

[neolectron]

Problem

Modules aren't encapsulated, they should have a schema to define the shape of the environment they need.

Solution

Allow modules to export a zodSchema to validate env.

[neolectron]

I think one of the blocker is that we do not have a module-creator.

I tried several things, and in order to get all the keys inside the env object in a module, I need to declare my modules as satisfies BotModule which can be annoying for modules dev.

Then the solution was to have a function like getEnv() that would be typesafe and return the requested environment variables. I couldn't do it simply.

Therefore I would consider putting this on blocked until we have the module-creator.
I picture something like :

export const myModule = createModule((ctx) => ({
  env: {
	MY_ENV_VAR: z.string().optionnal()
  },
  storage: {
  	channelList: z.string().array()
  },
  slashCommands: {/*...*/},
  eventHandlers: {
  	messageCreate: async () => {
		// Here I would be able to use ctx.env and ctx.storage
		console.log(ctx.storage.channelList) // typesafe + can be validated
  	}
  },
}));

[neolectron]

deprecated by #81