feat: add babel plugin for optional chaining

[chrishavekost]

Will allow anyone on newer versions of availity-workflow to use optional chaining in their apps. Turning something like:

return (
    (resp &&
      resp.data &&
      resp.data.regions &&
      resp.data.regions[0] &&
      resp.data.regions[0].id) ||
    undefined
  );

into:
return resp?.data?.regions?.[0]?.id

[GoPro16]

I would recommend also updating the example project in this repo to use it so we can double confirm that the plugin does in fact work.

[TheSharpieOne]

This is in TS 3.7 and is coming to CRA as soon as other libs (prettier) support it (see facebook/create-react-app#7438).

I would suggest waiting else you will break things like prettier.

[TheSharpieOne]

Looks like everything is good to go! Those using vscode may run into prettier/prettier-vscode#1027

[GoPro16]

Lol you referenced it and was immediately closed after.