Add "--only" option to process only a single rule #6441
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The option for the "process" and "list-rules" commands applies the single given rule only, without needing to modify the configuration file.
The option value must be a fully classified class name:
A hint is given when the user forgot to escape the backslashes.
It is impossible to modify the injected "$rectors" after the command line configuration is parsed, so I had to introduce the ConfigurationRuleFilter singleton.
Since both ListRulesCommand and ProcessCommand make use of the ConfigurationRuleFilter - but list-rules does not have a Configuration - I had to make the filterOnlyRule() method public to prevent code duplication.
Resolves rectorphp/rector#8899
Test it: