Switch to "true" dependency injection

[JoshuaKGoldberg]

Right now, stores typically have the following kind of logic:

// ContainerStore.ts
import { ChildStore, IChildStoreDependencies } from "./ChildStore";

export interface IContainerStoreDependencies extends IChildStoreDependencies { /* .. */ }

export class ContainerStore {
    public readonly child = new ChildStore(this.dependencies);
}

This means a lot of stores have really big dependencies typings. It would be more true to the DI way if the child stores were passed into the parents.