jinja : implement mixed type object keys (#18955)

jinja : implement mixed type object keys (#18955)

* implement mixed type object keys

* add tests

* refactor

* minor fixes

* massive refactor

* add more tests

* forgotten tuples

* fix array/object is_hashable

* correct (albeit broken) jinja responses

verified with transformers

* improved hashing and equality

* refactor hash function

* more exhausive test case

* clean up

* cont

* cont (2)

* missing cstring

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Co-authored-by: Xuan Son Nguyen <redacted>