How to call provider during application boot

## Description / Steps to reproduce / Feature proposal
Hi, I have a Provider bind to services.MyProvider in application.ts, I need call the Provider inside a method in application.ts

## Current Behavior
```ts
constructor(options: ApplicationConfig = {}) {
super(options);
this.sequence(MySequence);
this.projectRoot = __dirname;
this.bind('services.MyProvider').toClass(
MyProvider
);
this.bootOptions = {
controllers: {
dirs: ['controllers'],
extensions: ['.controller.js'],
nested: true,
},
};
try {
this.callFunctionMyProvider();
} catch (error) {
console.log(error);
}
}
```

TIA

Review the application.ts constructor and the services.MyProvider binding shown in the issue, then trace the application's boot lifecycle to identify where provider access belongs. Done means documenting or specifying a supported way to call the provider during application startup, with any relevant usage example or test identified.

Written by the indexing model from the issue text.