Support renaming all fields and constructors

[leostera]

We'd like to support renaming all the fields in a record or variant constructor names with a type-level attribute.

This issue tracks the different kinds of renaming supported:

Record Fields

• lowercase – myField becomes myfield
• UPPERCASE – my_field becomes MY_FIELD
• camelCase – my_field becomes myField
• PascalCase – my_field becomes MyField
• snake_case– my_field becomes my_field
• SCREAMING_SNAKE_CASE– my_field becomes MY_FIELD
• kebab_case– my_field becomes my-field
• SCREAMING_KEBAB_CASE– my_field becomes MY-FIELD

Constructors

• lowercase – My_variant becomes my_variant
• UPPERCASE – My_variant becomes MYVARIANT
• camelCase – My_variant becomes myVariant
• PascalCase –My_variant becomes MyVariant
• snake_case– My_variant becomes my_variant
• SCREAMING_SNAKE_CASE – My_variant becomes MY_VARIANT
• kebab_case– My_variant becomes My-variant
• SCREAMING_KEBAB_CASE– My_variant becomes MY-VARIANT