ign -> gz Namespace Migration : gz-msgs

[methylDragon]

See gazebo-tooling/release-tools#711

Note: The include/gz/msgs redirection headers point to ignition and use the ignition namespace, that's why they need the config.hh to support the namespace remaps in downstream packages.

[chapulina]

I believe we should be able to tick-tock headers and namespaces. The only thing we haven't found a way of tick-tocking is custom message generation. Most Gazebo libraries and external users don't create custom messages though, so I think it's worth at least tick-tocking headers and namespaces.

I tried these small changes on top of your branches:

• namespace_migration...chapulina/namespace_migration
  • Add ignition redirection headers for the generated protobuf (only did one msg as a POC)
  • Add namespace alias with pragma warning
• gazebosim/gz-transport@namespace_migration...chapulina/namespace_migration
  • Changed one place on ign-transport to include the old header and use the old namespace.
  • The test compiles with a warning, and passes.

What do you think?

[methylDragon]

Migration updated accordingly: e99f08a

[chapulina]

Oh yeah, and because so many files are being moved, we'll need a clean commit history to rebase-merge here. 🙃

[methylDragon]

Oh yeah, and because so many files are being moved, we'll need a clean commit history to rebase-merge here. upside_down_face

The files being moved here are the redirection headers added in the header migration, do we need to preserve the history for those (there's no history aside from that single commit)?

[chapulina]

The files being moved here are the redirection headers added in the header migration, do we need to preserve the history for those (there's no history aside from that single commit)?

Ah fair point, we can squash merge this PR then!

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LGTM with 🟢 CI

[codecov]

Codecov Report

Merging #252 (976c405) into main (03a7434) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #252   +/-   ##
=======================================
  Coverage   15.90%   15.90%           
=======================================
  Files         382      382           
  Lines       71409    71409           
=======================================
  Hits        11361    11361           
  Misses      60048    60048           

Impacted Files	Coverage Δ
include/ignition/msgs/statistic.pb.cc
include/ignition/msgs/wireless_nodes.pb.cc
include/ignition/msgs/discovery.pb.cc
include/ignition/msgs/request.pb.cc
include/ignition/msgs/projector.pb.cc
include/ignition/msgs/model_configuration.pb.cc
include/ignition/msgs/rest_post.pb.cc
include/ignition/msgs/camera_cmd.pb.cc
include/ignition/msgs/log_playback_control.pb.cc
include/ignition/msgs/physics.pb.cc
... and 563 more

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