[reanalyze] [bug] panic calls should not result in suggested annotations

[tx46]

repro:

let foo = () => {
  panic("foo")
}

reanalyze gives:

{
  "name": "Exception Analysis",
  "kind": "warning",
  "file": "Foo.res",
  "range": [20,4,20,7],
  "message": "foo might raise JsExn (Foo.res:22:2) and is not annotated with @raises(JsExn)",
  "annotate": { "line": 20, "character": 0, "text": "@raises(JsExn)\n", "action": "Add @raises annotation"}
}

although technically correct, it's not interesting because you're never supposed to catch it anyway.

either replace the exception thrown by panic to be named Panic and keep the raises annotation suggestion (makes it clear that the path can panic) or have reanalyze exclude panic calls from analysis.