Generate const and numeric enums for TypeScript

There are a lot of scenarios which requires [`const enum`](https://www.typescriptlang.org/docs/handbook/enums.html#const-enums) and [numeric enum](https://www.typescriptlang.org/docs/handbook/enums.html#numeric-enums) in addition to [`string enum`](https://www.typescriptlang.org/docs/handbook/enums.html#string-enums).

Would be great to be able to control the type of enum to be issued.

The similar requirements has been mentioned in #610 and #1044.

The issue names no implementation files, tests, or entry points. Start by tracing the TypeScript enum-generation path and reviewing related issues #610 and #1044; done means providing control over const, numeric, or string enum output and verifying the generated results.

Written by the indexing model from the issue text.