Add warning to schema parser if field name is not snake_case. (#6005)

Add warning to schema parser if field name is not snake_case. (#6005)

* Added code gen for evolution tests back in.

* General generate code and clang format

* Added code gen for evolution tests back in.

* General generate code and clang format

* reran generate_code.sh

* Added code gen for evolution tests back in.

* General generate code and clang format

* Added code gen for evolution tests back in.

* General generate code and clang format

* Enforce snake_case for schema field names

* Switched to basic for loop, Fixed warning message