Some path formats in intrinsic functions do not parse properly

[Fryguy]

Some odd forms of JSON path are not properly parsed by the path parser in intrinsic functions, and we need a more thorough json path parser to implement them. Even so, they are odd cases and are unlikely to occur in most real-world implementations. Those cases are defined in specs here:

• floe/spec/workflow/intrinsic_function/parser_spec.rb

  Lines 161 to 163 in a2bd4ee

  	# TODO: These unlikely cases should work, but we need a more thorough parser.
  	expect(subject).to_not parse(%q|$['s,tore']|)
  	expect(subject).to_not parse(%q|$['s)tore']|)