feat(pocket-ic): support custom blockmaker metrics at each round #25296

Job	Run time
Bazel Build Fuzzers	1m 54s
Bazel Build Fuzzers AFL	1m 18s
Bazel Build All Config Check	0s
Bazel Test All	23m 3s
Bazel Test macOS Intel	0s
Build IC	13m 1s
Cargo Build Release Linux	9m 6s
Cargo Clippy Linux	3m 40s
Python CI Tests	2m 54s
Build Determinism (//publish/binaries:upload, release, build-ic/release, false)	19s
Build Determinism (//publish/canisters:upload, canisters, build-ic/canisters, false)	12s
Build Determinism (//ic-os/guestos/envs/prod:upload_disk-img, guest-os/update-img, build-ic/icos/...	15s
Build Determinism (//ic-os/hostos/envs/prod:upload_update-img, host-os/update-img, build-ic/icos/...	13s
Build Determinism (//ic-os/setupos/envs/prod:upload_disk-img, setup-os/disk-img, build-ic/icos/se...	16s
	56m 11s

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