nx-builder automate dev workspace management

To ease release automation, the dev workspace should be manage by nx-builder.
Possible layout:

nx-builder-workspace

new command to add

• nx-builder init-workspace
  create the tree layout, clone nuxeo sources, download jboss archives,

• nx-builder push
  push dev directory changes to the nuxeo repo

• nx-builder status
  check if there is there is some update on dev directory, warn if there is outgoing changes

command to update

• nx-builder init/prepare -> pull dev dir then release dir, check there is no outgoing change

• nx-builder perform