Externally Unionize

This package provide extension for original unionize package, for create Externally tagged representation.

Externally tagged enum representation provide by default via Rust Serde and for Python Pydantic via typenum library.

Dependency from unionize unnecessary, but it small and not affect to compiled code (when not used), therefore insert into dependency intentionally.

Compatability with Python\Rust provided representation described in typenum package.

Example

#### Internally (original unionize)
``typescript
import { unionize, ofType } from 'unionize';

const MyEnym = unionize({
First: ofType<{ id: number; text: string }>(),
Second: ofType<{ id: number; }>(),
});

// {"tag":"First","id":1,"text":"test"}
console.log(JSON.stringify(MyEnum.First({ id: 1, text: "test" })))
`

#### Adjacently (original unionize)
`typescript
import { unionize, ofType } from 'unionize';

const MyEnym = unionize({
First: ofType<{ id: number; text: string }>(),
Second: ofType<{ id: number; }>(),
}, {tag: "tag", value: "value"});

// {"tag":"First","value":{"id":1,"text":"test"}}
console.log(JSON.stringify(MyEnum.First({ id: 1, text: "test" })))
`

#### Externally
`typescript
import { ofType } from 'unionize';
import { extUnionize } from 'ext-unionize';

const MyEnym = extUnionize({
First: ofType<{ id: number; text: string }>(),
Second: ofType<{ id: number; }>(),
});

// {"First":{"id":1,"text":"test"}}
console.log(JSON.stringify(MyEnum.First({ id: 1, text: "test" })))
``