Use rpyutils import_c_library function for rosbag2_transport_py

[emersonknapp]

Use rpyutils import_c_library function for rosbag2_transport_py - instead of re-defining the logic here (with outdated information)

Depends on ros2/rpyutils#4
Closes #445

[emersonknapp]

using https://gist.githubusercontent.com/emersonknapp/03048af0c22cf44348e76a3da1e1dd1b/raw/5fc3c523f2e6446a0d7e941d7cff9d90c13f4eaa/ros2.repos

• Linux

• Linux-aarch64

• macOS

• Windows

• Windows (re-triggered to check for flaky test)

• Windows Debug

Since library loading can sometimes misbehave on Windows Debug, added a CI run specifically testing it.

[Karsten1987]

@emersonknapp this branch can be deleted, I think.

[Karsten1987]

Also, the URL should be corrected in older/existing distros. I guess this PR can't really be used to be backported, can it?

[emersonknapp]

Ah - this I didn't think all the way through - we could backport this only into Foxy because rpyutils was added in that distro.

What do you think about a single backport patch commit to Foxy, Eloquent, and Dashing that just copies the contents of the new rpyutils function?

[Karsten1987]

What do you think about a single backport patch commit to Foxy, Eloquent, and Dashing that just copies the contents of the new rpyutils function?

I think it makes sense to backport this PR to Foxy. For Eloquent and Dashing I would actually really just change the URL.