Add an auto_alias compiler pass

Discussion see https://github.com/symfony/symfony/issues/11460

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | [#11460]
| License       | MIT
| Doc PR        |
In this test, the processing will not do anything, because it will not find any tagged services. The service defined as example has already been overwritten by an alias and so does not exist anymore