Add a new Bitbucket service to support creating a commit status and creating a comment to the associated pull requests

There is no Bitbucket integration for status update. The only way is to configure the webhook to send a REST request, but it only supports one single REST call.

If we want to create both a commit status and a comment to the associated pull requests, it's better to have a Bitbucket service.

Start by locating the existing service integrations and the webhook REST-request path in the repository. Review how services create commit statuses and pull-request comments, then compare those entry points with Bitbucket's status and comment operations. Done means a Bitbucket service can perform both requested actions instead of requiring separate webhook configuration.

Written by the indexing model from the issue text.