Add tests for JSONPath unicode support

[khvn26]

Particularly because JSONPath engines rely on regular expressions, which unicode support vary in programming languages, we need to make sure that our selected JSONPath implementations in every SDK are functioning when they find JSONPath selectors or traits containing non-ASCII characters and other characters with special meaning to regular expressions.

Interesting examples:

• $.identity.traits.tamaño
• $.identity.traits['サイズ.[withdot]']

The test case should ensure the engine JSONPath tool will correctly parse JSONPath and escape trait names when necessary.