Make Groovy Parser correctly handle nested parenthesis

[Laurens-W]

What's changed?

Nested parentheses around method invocations are supported as well for the groovy parser.

What's your motivation?

• Groovy parser does not correctly handle nested parenthesis #4703
• Gradle parser fails with extra parens around an expression #4615

Checklist

• I've added unit tests to cover both positive and negative cases
• I've read and applied the recipe conventions and best practices
• I've used the IntelliJ IDEA auto-formatter on affected files

[jevanlingen]

Very nice work, at last we have a working implementation!