Revive JavaScript Bindings (#1177)

Summary:
Yoga's JavaScript bindings do not work past Node 10, or on recent versions of Ubuntu even using it. This is due to a reliance on `nbind`, a library which is no longer maintained. `nbind` itself abstracts over `embind` running Emscripten to generate an asm.js build, along with building Node native modules. In the meantime, [yoga-layout-prebuilt](https://www.npmjs.com/package/yoga-layout-prebuilt) has been used by the community instead of the official package.

https://github.com/facebook/yoga/pull/1177 was contributed as a conversion of bindings created using `nbind` to instead use `embind` directly.

I continued building on this to add more:
1. WebAssembly support (required to be async in browsers)
2. CMake + Ninja Build for the 4 flavors
3. TypeScript typings (partially generated)
4. yarn scripts to build (working on macOS, Ubuntu, Windows)
5. A README with some usage and contribution instructions
6. Updated tests to work with Jest, and updated general infra
7. ESLint and clang-format scripts
8. More GitHub actions (and now testing Windows)
9. Probably more I kinda got carried away here lol

The plan is to eventually publish this to NPM, but there is a little bit of work after this before that happens.

Pull Request resolved: https://github.com/facebook/yoga/pull/1177

Test Plan: The bindings pass Jest tests (both manual and generated). GitHub actions added for the different yarn scripts. Did some manual checks on using the library as TS.

Reviewed By: christophpurrer

Differential Revision: D42207782

Pulled By: NickGerleman

fbshipit-source-id: 1dc5ce440f1c2b9705a005bbdcc86f952785d94e

.github/workflows/validate-apple.yml

@@ -10,7 +10,6 @@ on:
 jobs:
   lint-pods:
     name: Lint
-    if: ${{ false }} # Apple Build is Broken
     runs-on: macos-latest
 
     steps:
@@ -21,10 +20,10 @@ jobs:
 
       - name: pod spec lint
         run: pod spec lint --verbose
+        continue-on-error: true # Apple Build is Broken
 
   build-sample:
-    name: Build (${{ matrix.mode }})
-    if: ${{ false }} # Apple Build is Broken
+    name: Build [${{ matrix.mode }}]
     runs-on: macos-latest
     strategy:
       matrix:
@@ -37,8 +36,9 @@ jobs:
         uses: ./.github/actions/setup-apple
 
       - name: pod install
-        working-directory: ./YogaKit/YogaKitSample
         run: pod install
+        working-directory: ./YogaKit/YogaKitSample
+        continue-on-error: true # Apple Build is Broken
 
       # TODO: xcodebuild