Release cargo extensions as Debian packages on PackageCloud

[esteve]

Both colcon-cargo, colcon-ros-cargo and cargo-ament-build are released as Python wheels on PyPI, we'd like release them as Debian packages as well so that users no longer need to use pip. And also because since Ubuntu 24.04, it's more cumbersome to install Python wheels via pip.

cc @cottsay

[esteve]

@cottsay how should we distribute our colcon extensions as Debian packages via PackageCloud? Does any of us (@jhdcs @luca-della-vedova @maspe36 @mxgrey) need access to PackageCloud or is it something we can automate? Thanks.