feat(packages): add commons package

This is an import of 166ca8da12
with some changes to make it fit into the mono repo.
- TypedEventEmitter has been replaced with EventEmitter2 because EventEmitter2 is faster and TypedEventEmitter had some troubles with the new way of compiling.
- tsc-esm has been replaced with microbundle. The problems that lib0 doesn't export its types correctly has been solved using yarn patch.

Signed-off-by: Tilman Vatteroth <git@tilmanvatteroth.de>

.yarn/patches/y-protocols-npm-1.0.5-af6f64b4df.patch

@@ -0,0 +1,26 @@
+diff --git a/package.json b/package.json
+index 5f953f00544710a638dc502b30841d39193f6d3f..6c31784d1b1f32ee8f21106011c4e6ef526f1560 100644
+--- a/package.json
++++ b/package.json
+@@ -47,18 +47,21 @@
+     "./sync.js": "./sync.js",
+     "./dist/sync.cjs": "./dist/sync.cjs",
+     "./sync": {
++      "types": "./sync.d.ts",
+       "import": "./sync.js",
+       "require": "./dist/sync.cjs"
+     },
+     "./awareness.js": "./awareness.js",
+     "./dist/awareness.cjs": "./dist/awareness.cjs",
+     "./awareness": {
++      "types": "./awareness.d.ts",
+       "import": "./awareness.js",
+       "require": "./dist/awareness.cjs"
+     },
+     "./auth.js": "./auth.js",
+     "./dist/auth.cjs": "./dist/auth.cjs",
+     "./auth": {
++      "types": "./auth.d.ts",
+       "import": "./auth.js",
+       "require": "./dist/auth.cjs"
+     }