feat(autoware.repos): added ros2_spconv

[knzo25]

Description

Temporarily adds https://github.com/knzo25/ros2_spconv
to the autoware.repos file to test compilation times

How was this PR tested?

Notes for reviewers

None.

Effects on system behavior

None.

[github-actions]

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[xmfcx]

It failed without CUDA. Default behavior in Autoware packages is to skip building the CUDA packages yet report success for build 🤷 (like in autoware_lidar_centerpoint/CMakeLists.txt)

• https://github.com/autowarefoundation/autoware/actions/runs/12785340931/job/35640149638?pr=5658#step:5:7462

[knzo25]

@xmfcx
In this case, it seems to be because the second line of the cmakelist uses project(spconvlib LANGUAGES CXX CUDA).
By selecting it as a language, the rest of the cmake commands act different, which was needed to port the original cmake without many changes. I will try to find a way that does not make to much changes on the autogenerated code yet it is compliant with our way to do things 🙏