Initial implementation of RKAB based on multiple time levels of the R… #1320

Job	Run time
download-build-test (cpu, real32, debug)	12m 24s
download-build-test (cpu, real64, debug)	12m 18s
download-build-test (cpu, real64, optimize)	17m 15s
download-build-test (cuda, real32, debug)	23m 40s
download-build-test (cuda, real64, debug)	24m 26s
download-build-test (cuda, real64, optimize)	23m 2s
download-build-test (rocm, real64, optimize)	19m 56s
	2h 13m 1s

Provide feedback