Ability to add Global webhook which applies to all the repositories

Provide the ability to add a global webhook which will apply on all the repositories under a single account instead of adding it to each repository manually.

Current Workaround with Bitbucket API:

1. Use /2.0/repositories/ {username} to get a list of all repositories. Bitbucket API Repositories Resource
   # Use /2.0/repositories/{username}

   /

   {repo_slug}

   /hooks to add the webhook. Bitbucket API Webhook Resource