refactor(ts): cleanup output and use as const and type extraction

[casaper]

Typescript constant output typing uses extraction from enum or from the constant (when defined with as const).

Examples:

export enum MyIconsSet {
  Foo = 'foo',
  Bar = 'bar',
}


export type MyIconsSetId = `${MyIconsSet}`;


export const MY_ICONS_SET_CODEPOINTS: readonly { [key in MyIconsSetId]: string } = {
  'foo': '4265',
  'bar': '1231',
} as const;

Or extracting it from the const:

export const MY_ICONS_SET_CODEPOINTS = {
  'foo': '4265',
  'bar': '1231',
} as const;

export type MyIconsSetKey = typeof MY_ICONS_SET_CODEPOINTS[number];