Support for using hyphens on yaml config for packages names, according to issue symfony#28122 (comment)

| Q             | A
| ------------- | ---
| Branch?       | master
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no     <!-- see https://symfony.com/bc -->
| Deprecations? | no
| Tests pass?   | yes (Manual tests only)
| Fixed tickets | symfony#28122
| License       | MIT
| Doc PR        | n/a

According to issue symfony/symfony-docs#10442, we tested in a demo bundle, for example in src/AppBundle/Resources/config/config.yml a package using hyphens: app-client-frontend, and withouth the patch it fails because the package is not recognized. With the patch, it works as expected.
```
framework:
    assets:
        packages:
            app-client-frontend:
                version: "%env(FRONTEND_VERSION)%"
                version_format: '%%2$s/dist/%%1$s'
                base_urls:
                  - "%env(FRONTEND_URL)%"
```