Create a webhook for a workspace

Creates a new webhook on the specified workspace. Workspace webhooks are fired for events from all repositories contained by that workspace. Example: ``` $ curl -X POST -u credentials -H 'Content-Type: application/json' https://api.bitbucket.org/2.0/workspaces/my-workspace/hooks -d ' { "description": "Webhook Description", "url": "https://example.com/", "active": true, "secret": "this is a really bad secret", "events": [ "repo:push", "i...