Enhance all code generation for x-db-type

[SOHELAHMED7]

Enhance parts such as

• models,
• controllers,
• faker etc and all pertinent code generation to

consider

• x-db-type (timestamp migrations do not work in MariaDB #100)
• json (json field related errors #109)
• enum (For ENUM colums, existing column gets an update which removes the "string type" #111) (already implemented, test again)

Above issues focus to fix only migration code generation part. Once it is done for migrations, we can move to enhance above parts

[SOHELAHMED7]

Closing this as this is noted in #122