Remove copied shallowEqual code - use fbjs

[rosskevin]

• Remove copied code shallowEqual and delegate to fbjs
• change tsconfig.json to allow for direct import = require of commonjs modules

[apollo-cla]

	Warnings
⚠️	There are library changes, but not tests. That's OK as long as you're refactoring existing code

Generated by 🚫 dangerJS

[evocateur]

Adding a dependency on fbjs for one function seems a rather Pyrrhic victory. Now anyone bundling this library gets a giant blob of unused, non-tree-shakeable code. :/