🚀 Feature: Add (back) type aliasing

[JoshuaKGoldberg]

🚀 Feature Request

It's sometimes useful to replace added TypeScript types with other strings. Most commonly, some conversions use a type like type $AnyTodoFixMeTS49 = any; instead of any to make it clear that the any should be fixed up eventually.

Existing Behavior

TypeStat does not support these kinds of aliases.

Change Proposal

Let's add in a new option with a name like ... typeAliases, perhaps? Maybe it could be a Record<string, string> keying aliases (strings, allowing for stringified regular expressions) to their replacement?

{
  "typeAliases": {
    "any": "$AnyTodoFixMeTS49",
    "/Promise.+/": "Promise$1 /* todo: just use a Promise? */"
  }
}

Additional Information

TypeStat actually used to have this! I'd removed the feature in #793 (and docs in eedded4) #765 easier. But now that #765 is done, it'd be useful to add this option back.

Thanks @tannerlinsley for reminding me of this!