Use our own flowRight-like function instead of using lodash.flowright.

In addition to being smaller, this implementation does not require using CommonJS require to import a separate package.

This reduces the minified size of lib/react-apollo.umd.js from 28074B to
22773B (18.9%). The minified+gzip size drops from 6930B to 6451B (6.9%).

The gzip percentage is smaller because there was some repetition between
the multiple declarations of the __extends function, and gzip is good at
compressing long repeated substrings.

* chore: optimize build time

* fix: remove comments

* tests: revert transforms

* fix tests

* remove babel key from pkg.json

* chore: apply pr remarks

* chore: undo all and add esm bundle with potential todo

* remove unused babel plugins

* cjs

* some optimizations

* add question

* chore: follow pr

* ignore rpt_cache

@JoviDeCroock @Pajn @rosskevin I'm hoping this prerelease helps with
testing the changes in PR #2661.

This shaves a tiny amount of bundle size, but more importantly it
implements shallowEqual using TypeScript, and avoids one of the few
remaining uses of require.