Implement unified ETLS without TBB and use it for all host backends #730

Job	Run time
HOST,bknd=omp,cmplr=clang++,macos-latest,std=c++17,cfg=release	5m 10s
HOST,bknd=tbb,cmplr=icx-cl,windows-latest,std=c++17,cfg=release	7m 25s
CPU,bknd=dpcpp,cmplr=icpx,ubuntu-latest,std=с++17,cfg=release	7m 39s
HOST,bknd=tbb,cmplr=cl,windows-latest,std=c++17,cfg=release	7m 26s
clang-format	1m 3s
FPGA_EMU,bknd=dpcpp,cmplr=icpx,ubuntu-latest,std=с++17,cfg=release	7m 39s
CPU,bknd=dpcpp,cmplr=icx,windows-latest,std=c++17,cfg=release	7m 24s
HOST,bknd=tbb,cmplr=icpx,ubuntu-latest,std=с++17,cfg=release	7m 39s
HOST,bknd=omp,cmplr=icpx,ubuntu-latest,std=с++17,cfg=release	7m 38s
HOST,bknd=omp,cmplr=g++,ubuntu-latest,std=с++17,cfg=release	6m 32s
HOST,bknd=tbb,cmplr=g++,ubuntu-latest,std=с++17,cfg=release	7m 40s
HOST,bknd=tbb,cmplr=g++,ubuntu-latest,std=с++17,cfg=release	7m 40s
HOST,bknd=tbb,cmplr=clang++,ubuntu-latest,std=с++17,cfg=release	7m 41s
HOST,bknd=omp,cmplr=clang++,ubuntu-latest,std=с++17,cfg=release	7m 40s
HOST,bknd=tbb,cmplr=clang++,ubuntu-latest,std=с++17,cfg=release	7m 40s
HOST,bknd=tbb,cmplr=icpx,ubuntu-latest,std=с++17,cfg=release	7m 39s
HOST,bknd=serial,cmplr=g++,ubuntu-latest,std=с++17,cfg=release	5m 22s
CPU,bknd=dpcpp,cmplr=icpx,ubuntu-latest,std=с++20,cfg=release	2m 20s
HOST,bknd=tbb,cmplr=icpx,ubuntu-latest,std=с++20,cfg=release	7m 34s
HOST,bknd=omp,cmplr=icpx,ubuntu-latest,std=с++20,cfg=release	7m 22s
	2h 14m 13s

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