feat(pocket-ic): support custom blockmaker metrics at each round #25283

Job	Run time
Bazel Build All Config Check	0s
Bazel Build Fuzzers	1m 53s
Bazel Build Fuzzers AFL	2m 41s
Bazel Test All	23m 13s
Bazel Test macOS Intel	0s
Build IC	16m 27s
Cargo Build Release Linux	8m 4s
Cargo Clippy Linux	3m 39s
Python CI Tests	3m 7s
Build Determinism (//publish/binaries:upload, release, build-ic/release, false)	16s
Build Determinism (//publish/canisters:upload, canisters, build-ic/canisters, false)	13s
Build Determinism (//ic-os/guestos/envs/prod:upload_disk-img, guest-os/update-img, build-ic/icos/...	18s
Build Determinism (//ic-os/hostos/envs/prod:upload_update-img, host-os/update-img, build-ic/icos/...	17s
Build Determinism (//ic-os/setupos/envs/prod:upload_disk-img, setup-os/disk-img, build-ic/icos/se...	20s
	1h 0m 28s

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