[Implementation Guide] - JSON Path deps

- colby pointed out today that the recommended kotlin lib removes "in-path functions" -
+ is that a problem? will that make holders throw when interacting with an eval-happy verifier? ongoing discussion about how implementations with very-liberal and very-locked-down security policies re: filter expressions can gracefully interact without just dropping or throwing
- [ ] decision taken on this week's call to figure out some reasonable guidance on constraining/sandboxing JSONPath and auditing recommended libraries against that guidance before putting back in
- [ ] decision taken on this week's call to remove [impl recommendations](https://identity.foundation/presentation-exchange/#jsonpath-implementations) and [carefully] put back in to future implementation guide