move away from json-schema-to-typescript

[pyramation]

Currently we're depending on json-schema-to-typescript, however, it's limited (as noted here #10) so we should look into fully parsing/processing types internally

examples to inspire

https://github.com/iamssen/cosmwasm-typescript-generator/blob/main/cosmwasm-typescript-generator/src/transform/createTypeStore.ts

https://github.com/bcherny/json-schema-to-typescript/blob/master/src/typesOfSchema.ts

https://github.com/bcherny/json-schema-to-typescript/blob/master/src/types/JSONSchema.ts

[pyramation]

why we need to do write this ourselves eventually:

• Generate crashes with Empty enum msg #27
• Enums are not translated to types #10