Fix Utils.inspect and Utils.to_s to allow zero arguments

[shivaansh74]

Fixes #2107

Problem

Calling Liquid::Utils.inspect or Liquid::Utils.to_s without arguments raised an ArgumentError instead of delegating to super (the default module inspect/to_s representation).

Solution

• Updated Liquid::Utils.inspect and Liquid::Utils.to_s to accept variable arguments (*args).
• When called with zero arguments, they call super, returning the module name representation.
• When called with arguments, they preserve the existing object inspection and formatting behavior.
• Added unit tests in test/unit/utils_unit_test.rb to verify zero-argument and object-argument behaviors.