feat token-bucket: add statistics #7864

Job	Run time
ubuntu-24.04: gcc-13 + release	31m 52s
ubuntu-22.04: g++-10 + release	1h 24m 44s
ubuntu-24.04: clang-18 + debug + sanitize addr+ub	16m 24s
ubuntu-22.04: clang-14 + debug + sanitize addr+ub	1h 13m 31s
	3h 26m 31s

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