Add blake3 benchmark for merkledb #7816

Job	Run time
Up-to-date protobuf	18s
e2e_existing_network	4m 9s
Up-to-date mocks	1m 56s
Protobuf Lint	6s
e2e_pre_etna	10m 55s
e2e_post_etna	11m 33s
Fuzz	13m 33s
Up-to-date go.mod and go.sum	20s
Lint	3m 20s
Build Antithesis avalanchego images	8m 30s
Build Antithesis xsvm images	12m 15s
Image build	10m 49s
Unit (macos-12)	9m 16s
Upgrade	3m 19s
Unit (ubuntu-20.04)	7m 32s
Unit (ubuntu-22.04)	6m 48s
Unit (windows-2022)	13m 22s
Unit (custom-arm64-focal)	15m 1s
Unit (custom-arm64-jammy)	12m 18s
	2h 25m 20s

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