deps: update extractErrors plugin to Babel 7 and more

Description

This plugin was out-of-date by a good bit, so have updated a good bit to a more current version.

Commits

license: add FB License header to all extractErrors code

this plugin is largely borrowed from the React monorepo, consistently add FB's License headers to each file, not just to extractErrors.ts
also add comments pointing to the exact file and commit that each file was copied from
- most of these are slightly out of date now:
- evalToString is missing a line
- extractErrors needs to be updated to Babel 7
  - babylon -> @babel/parser, babel-traverse -> @babel/traverse
- transformErrorMessages has several new constructs added :/...
  - keeping a pseudo-fork up-to-date is pretty tedious and not very maintainble (it's also broken per the tests I've added)
  - would be better if we could ask FB to split out theirs as a separate package...

clean: bad whitespace and Flow types in extractErrors

whitespace errors in extractErrors
unnecessary Flow comments in invertObject when we're using TS
- also inconsistent, it looks like they've been removed and replaced with TS elsewhere
- here TS types were added but Flow was also left in

deps: update extractErrors Babel plugins to Babel 7

this was using Babel 6's Babylon and babel-traverse, which meant two different versions of Babel were being used and a lot of unnecessary deps were in the tree
- now there should no longer be any Babel 6 deps in the tree
- also transformErrorMessages was already using Babel 7 (@babel/helper-module-imports) while extractErrors was on Babel 6 just for extra inconsistency 😬
- these two files seemed to be updated at the same time to Babel 7 as far as I can tell though 🤨
@babel/parser ships its own typings now, so no need to use the declare module workaround for it anymore
- but did have to add a type-cast as its usage doesn't entirely fit the type 😕
this also helps remove an old version of core-js v2, the addition of which would give a deprecation warning on install:
- "npm WARN deprecated core-js@2.6.11: core-js@<3 is no longer maintained and not recommended for usage due to the number of issues. Please, upgrade your dependencies to the actual version of core-js@3."

EDIT: forgot to mention I also checked the Babel 7 migration guide which mentions babel-traverse, babylon, and AST changes in general, which all seemed compatible to me (and React team must have checked it already too).

deps: update extractErrors plugin's evalToString file

a line was added upstream in the last year, so add it here too to be up-to-date
- now only transformErrorMessages is out-of-date ...but there's a little too many changes for me to really prioritize right now

Tags

Follow-up to #138 I suppose

Some React PRs that updated this part of their monorepo:

Babel 7: https://github.com/facebook/react/pull/16297
Babylon -> @babel/parser: https://github.com/facebook/react/pull/17988
Literal addition in evalToString: https://github.com/facebook/react/pull/17599

TODO to be added to transformErrorMessages... well I'd prefer asking FB/React to split out their code as a separate package than maintaining this though:

In tandem with #795 which removed the unused @babel/polyfill dep (and its core-js v2 dep), this should remove the last deprecation warning I know of that TSDX v0.13.3 has from https://github.com/formium/tsdx/pull/789#issuecomment-695854530 by removing the last core-js v2 usage:

npm WARN deprecated core-js@2.6.11: core-js@<3 is no longer maintained and not recommended for usage due to the number of issues. Please, upgrade your dependencies to the actual version of core-js@3. // @babel/polyfill and babel-traverse

jaredpalmer / tsdx