RenameVariables does not update named arguments everywhere

Nobody has claimed this yet.

Following up on #711, I notice that RenameVariables works on keyword also applies to arguments (which is what I was looking for), but does not update the instances where these arguments are used with their name. Which is unfortunate since:

>The named argument syntax is both case and space sensitive. The former means that if you have an argument `arg`, you must use it like `arg=value`, and neither `Arg=value` nor `ARG=value` works. The latter means that spaces are not allowed before the `=` sign, and possible spaces after it are considered part of the given value.

([source](https://robotframework.org/robotframework/latest/RobotFrameworkUserGuide.html#named-arguments))

However, I am not sure robotidy can handle this as it requires applying the change across multiple files.
Maybe raising a warning on this subject could be enough? Or a default configuration to not apply to keyword arguments.

BEFORE

AFTER

CODE TO REPRODUCE
```robot
My Keyword
[Arguments] ${expected error}
TRY
No Operation
EXCEPT ${expected error}
No Operation
END

Another Keyword
My Keyword expected error=my error pattern
```

Side Note: When I use RobotCode "rename symbol" feature, it nicely updates the named arguments all over the project.

Start with the RenameVariables behavior described in the issue and reproduce it using the provided Robot Framework example. Trace how the argument declaration and the named-argument call are handled; completion should either update named-argument uses consistently across the project or establish the warning/default configuration behavior agreed for this issue.

Written by the indexing model from the issue text.