feat: more idiomatic enums

[dzmitry-lahoda]

for pure numeric enums TS seems can

enum MyEnum {
    First = 0,
    Second,
    Third
}

for enums with bodies

class Foo {
  field: number,
}
class Bar {
  otherField: string,
}
export type Baz = Foo | Bar | boolean;

or

type MyEnum = {
    tag: "first",
    field: number,
}
| {
    tag: "second",
    field: string,
}
| {
    tag: "third",
    firstField: boolean,
    secondField: number,
};

[dzmitry-lahoda]

So best enum may appear enum which will be compatible with default serde crate behavior for same rust struct. So if I just create TS stuct and JSON in JS runtime, it will exactly same JSON as if I will put serde onto Rust struct ( for struct doing borsh and serde_json at same time)