sharded.hh: add invoke_on variant for a shard range #619

Job	Run time
Test with C++20 modules enabled / test	11m 30s
Test (clang++, C++20, dev) / test	9m 3s
Test with DPDK enabled / test	17m 2s
Test (clang++, C++20, debug) / test	11m 2s
Test (clang++, C++20, release) / test	9m 32s
Test (clang++, C++23, debug) / test	11m 12s
Test (clang++, C++23, dev) / test	9m 21s
Test (clang++, C++23, release) / test	16m 29s
Test (g++, C++20, debug) / test	14m 7s
Test (g++, C++20, dev) / test	7m 46s
Test (g++, C++20, release) / test	10m 40s
Test (g++, C++23, debug) / test	14m 47s
Test (g++, C++23, dev) / test	7m 45s
Test (g++, C++23, release) / test	11m 1s
	2h 41m 17s

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