PERF-#367: Use std::fill to fill service shared buffer with a given value #751

Job	Run time
lint (black)	10s
lint (flake8)	7s
test-ubuntu (backend ray, python 3.8)	9m 3s
test-ubuntu (backend mpi, python 3.8)	11m 48s
test-ubuntu (backend dask, python 3.8)	11m 12s
test-ubuntu (backend pymp, python 3.8)	17m 12s
test-ubuntu (backend pyseq, python 3.8)	15m 44s
test-ubuntu (backend ray, python 3.9)	15m 49s
test-ubuntu (backend mpi, python 3.9)	11m 26s
test-ubuntu (backend dask, python 3.9)	8m 38s
test-ubuntu (backend pymp, python 3.9)	12m 12s
test-ubuntu (backend pyseq, python 3.9)	8m 43s
test-windows (backend ray, python 3.8)	11m 42s
test-windows (backend mpi, python 3.8)	10m 15s
test-windows (backend dask, python 3.8)	13m 35s
test-windows (backend pymp, python 3.8)	9m 49s
test-windows (backend pyseq, python 3.8)	10m 11s
test-windows (backend ray, python 3.9)	9m 58s
test-windows (backend mpi, python 3.9)	13m 7s
test-windows (backend dask, python 3.9)	9m 5s
test-windows (backend pymp, python 3.9)	9m 32s
test-windows (backend pyseq, python 3.9)	9m 12s
	3h 48m 30s

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