As initial service config is in YAML format `symfony/yaml` should be required package

### Describe the bug

if the project does not require the `symfony/yaml` app with this bundle will fail to boot

### Expected Behavior

one of these
- state that the yaml package is required composer
- use php configuration in the bundle (preferred way)

### Current Behavior

exception thrown on app/kernel boot

### Reproduction Steps

create symfony starter project
configure it to use php configuration
remove `symfony/yaml`
install this bundle

### Possible Solution

dev can add the `symfony/yaml` (even if the app itself has no need for it)

### Additional Information/Context

_No response_

### SDK version used

bundle: 2.5.0
sdk: not explicitly specified (resolved by composer)

### Environment details (OS name and version, etc.)

N/A