* refactor - use helpers for name space and hashing
* use openai to get the relevant supported params
* use helpers for getting cache key
* fix test caching
* use get/set helpers for preset cache keys
* make get_cache_key under 100 LOC
* fix _get_model_param_value
* fix _get_caching_group
* fix linting error
* add unit testing for get cache key
* test_generate_streaming_content
