[ExpressionLanguage] Added ability to evaluate callables

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | https://github.com/symfony/symfony/issues/11938
| License       | MIT
| Doc PR        | 

This PR adds a way to pass callables when evaluating the expression. It also removes the first argument of the evaluator function, which makes it easier to directly register PHP functions for example.