[gpu][alpaka] Add initial integration of ALPAKA#2

Draft

sanjibansg wants to merge 22 commits intomainfrom

Commits on Nov 20, 2025

Commits on Nov 23, 2025

Commits on Nov 24, 2025

fix: linking issue because of incorrect symbols
sanjibansg
committed

Commits on Nov 27, 2025

fix: cmake script for tests
sanjibansg
committed

Commits on Dec 2, 2025

fix: define failures in EmitFromRoot.cxx.in (#6)
Saransh-cpp
authored

Commits on Dec 14, 2025

fix: layout inconsistencies in alpaka code generation
sanjibansg
committed

Commits on Dec 15, 2025

Commits on Jan 26, 2026