Storage component

Nobody has claimed this yet.

## Suggestion
Hello i'm writting a new component called Storage under /packages/storage folder and i want to know if you're okay with my implementation.

## Use Cases
For store files, images, videos. providers could be added through extensions thanks to Storage extension point.

## Examples
```ts

// application.ts
import { StorageComponent } from '@loopback/storage'
import { S3Storage } from '@loopback/storage-s3'

export class App extends Application {
constructor(opt: ApplicationConfig = {}) {
super(options);
this.component(StorageComponent)
app.add(createBindingFromClass(S3Storage))
}
}
// controller
import { StorageService } from '@loopback/storage'
import { LOCAL_STORAGE } from '@loopback/storage-local' // could be @loopback/storage-s3 or @loopback/storage-gcs

class UploadController {
constructor(
@service()
public storageService: StorageService,
) {}

async upload() {
// here LOCAL_STORAGE provide a key and type signatures for that provider
await this.storageService.create(LOCAL_STORAGE, {
filename: '/tmp/test.txt',
content: new Buffer(10)
});
}
}```

## Acceptance criteria

TBD - will be filled by the team.

Start by reviewing the proposal for the new /packages/storage component and its TypeScript usage examples. The issue does not name implementation files or tests, and its acceptance criteria are still TBD, so the work is not ready to begin until the team defines the provider extension point, supported storage operations, and completion checks.

Written by the indexing model from the issue text.