Validate "Command options"

[ctippler]

In the ProcessMangager Configuration we can define the command options.

We should somehow check if the provided command options are valid to prevent security issues. If the command options are not valid, an Exception should be thrown.

[ctippler]

The preparation work is done - if someone has an idea how we can properly validate the command options, a Pull-Request would be great.
The validation should be done in https://github.com/valantic-at/ProcessManager/blob/master/src/Service/CommandsValidator.php#L45

[ctippler]

Fixes: #227