Fastapi-cruddy-framework

- Adds additional openapi.json "meta" object examples for POST/PATCH/DELETE actions

- Adds default "simple" example generation for openapi.json to support mock servers like [imposter.sh](https://www.imposter.sh/)

The simple examples automatically generated only apply if a json_schema_extra example is not already set for a particular field for a model.

- Updates openapi typing to remove "anyOf" conditions on REST envelope payloads

- Removes all use of gather() to execute multi-session queries per https://github.com/sqlalchemy/sqlalchemy/discussions/9312

* Adds policy-safe cruddy graphql functionality (mirrors [sails-graphql-bolts](https://github.com/mdconaway/sails-graphql-bolts))
* Adds basic graphql tests
* Adds cruddy specific graphql pass-through types

- Adds a header blacklist for internal requests
- Minimizes response payload sizes in embedded relationship meta