fix: Fix argument parsing if params are present e.g. {RandomNumber(2,4)}

[das-peter]

Just stumbled over the fact that the argument parsing seems to fail if the argument contains params.
Example:
When I fill in "field1" with "{RandomNumber(2,4)}"
Will result in a value of "{RandomNumber(2,4)}" because \Transformation\Argument::supportsDefinitionAndArgument() will not recognize the argument as valid "function".
This is due to a to restrictive regexp in \Transformation\Argument::SLOT_NAME_REGEX.
This PR adjusts the related pattern and expands the test suite to catch this type of error.
If you run the test suite without the pattern adjustment it will fail, and it will completely pass once the pattern has been adjusted.

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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