[Validator] Support "maxSize" given in KiB

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #10962
| License       | MIT
| Doc PR        | symfony/symfony-docs#3895

To display the constraint validation message with an expected suffix, this PR add a new option in  File constraint.