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>

.github/workflows/frontend-netlify-deploy-main.yml

@@ -39,6 +39,7 @@ jobs:
         with:
           filters: |
             files:
+              - 'commons/**'
               - 'frontend/**'
               - '.github/**'
               - '.yarn/**'