add remote source code tasks file

[danroxha]

Description

This feature allows versioning scripts by separating the source definition in xczen.yaml to your own repository

script:
    tasks:
      - name: build project
        enable: true
        language: sh
        bind: bump
        when: after
        remote:
             header:
                  Authorization: Basic ${GIT_ACCESS_TOKEN_BASE64}
                  Content-Type:  text/plain
             url: http://github.com/dannRocha/xconv/blob/main/build.sh