CDK Refactor Phase 3 (while implementing Azle and Kybra)

[bdemann]

• Make sure assumption about func inline types is correct
• Clean up the lib file
• Consider getting rid of create_identifier if we aren't using it.
• Rename parental_prefix (See #27 (comment))
• Make a better name for HasEnclosedType (see: #27 (comment))
• Better name for public_canister_methods
• Investigate enforcing certain fields on a rust struct
• data_types folder to candid and DataTypes to CandidTypes

[bdemann]

The readme should help someone understand the high level architecture and how to use it. It should help a cdk developer develop a cdk. So azle book chapter 2 level of detail