Fix parsing logic of function parameters with closing parentheses

[q2w]

Currently a function with parameter which have parentheses is wrongly parsed. As soon as a closing parentheses is encountered, the parsing logic assumes end state for the function parameter. For example, given concat(sum(), 10) then sum( is treated as first parameter. This is wrong parsing logic.

A parameter should be treated completely parsed only when a , or, the last ) is encountered ( that is groupParen == 0)

[q2w]

@kallestenflo

Test Scenario: Json: {} Path: $.concat("Bob", $.concat(" Joe", " Alex"))

Before this change, this would result in the below error. Here the internal concat is not interpreted rightly because of this bug.

Arguments to function: 'concat' are not closed properly.
com.jayway.jsonpath.InvalidPathException: Arguments to function: 'concat' are not closed properly.

[q2w]

@kallestenflo