…ommandMessageHandler` (kbond)This PR was squashed before being merged into the 6.4 branch.Discussion----------[Console][Messenger] add `RunCommandMessage` and `RunCommandMessageHandler`| Q             | A| ------------- | ---| Branch?       | 6.3| Bug fix?      | no| New feature?  | yes| Deprecations? | no| Tickets       | n/a| License       | MIT| Doc PR        | todoSimilar to#49813, when using the scheduler it could be useful to execute commands.## Usage```phpuse Symfony\Component\Console\Exception\RunCommandFailedException;use Symfony\Component\Console\Messenger\RunCommandMessage;try {    $context = $bus->dispatch(new RunCommandMessage('my:command'));    $context->output; // string - output of command    $context->exitCode; // int - the exit codecatch(RunCommandFailedException $e) { // if exit code is non-zero or command threw exception    $e->context->output; // string - output of command    $e->context->exitCode; // int - the exit code    $e->getPrevious(); // null|\Throwable exception command threw if applicable}// "never" fail$context = $bus->dispatch(new RunCommandMessage('my:command', throwOnNonSuccess: false, catchExceptions: true));```TODO:- [x] wire up- [x] testsCommits-------dd5b0b7 [Console][Messenger] add `RunCommandMessage` and `RunCommandMessageHandler`