Function Enum

Enum(variantId: number, value: RelishValue): RelishEnum
Creates an enum Relish value (tagged union).

Enums represent one of several variants, each with a numeric ID (0-127) and an associated value. The variant ID and value are encoded together.
Parameters
- variantId: number
  Numeric ID (0-127) identifying which variant is active
- value: RelishValue
  RelishValue for the active variant
Returns RelishEnum
RelishEnum value
Example
```
import { Enum, String_, U32, encode } from '@grounds/core';

// Success variant with message
const success = Enum(0, String_('operation completed'));
encode(success).match(
  (bytes) => console.log('Success encoded:', bytes),
  (error) => console.error(error)
);

// Error variant with code
const error_ = Enum(1, U32(404));
encode(error_).match(
  (bytes) => console.log('Error encoded:', bytes),
  (error) => console.error(error)
);
```
Remarks
Variant IDs must be in range 0-127 (bit 7 must be clear).

See
Struct for heterogeneous fixed fields