Initialize the Monorepo

[binaryben]

Migrated the existing extensions to the packages subdirectory and retained their git history. Two caveats:

• About half build as is using PNPM. The others will need some tweaking to get them working
• Images in docs are still sourced from the existing extension repos

These issues will be resolved in another PR.

---

In case it's ever needed again, here is the commands to migrate extensions to this repo:

export EXTENSION="ai-focal-point-detection-operation" # Don't add the extension- prefix
export GIT_NAME=""
export GIT_EMAIL=""

cd ../extension-$EXTENSION &&
  mkdir -p packages/$EXTENSION &&
  git mv -k * packages/$EXTENSION &&
  git mv -k .* packages/$EXTENSION &&
  git config user.email $GIT_EMAIL &&
  git config user.name $GIT_NAME &&
  git commit -m "Moved files to monorepo directory structure" &&
  cd - &&
  git remote add -f ext ../extension-$EXTENSION &&
  git merge ext/main --allow-unrelated-histories &&
  git remote remove ext &&
  rm -rf ../extension-$EXTENSION

This assumes:

• You run the above from the root of this repo
• The existing extension repo being migrated is located in the same parent directory as this repo
• The existing extension repo folder is prefixed with extention-