Metrics for precommit

unable to locate any metrics in cometbft related to precommits. in the hub, we need to know:

The time between receiving a quorum of precommits and moving to the next block
The count and stake percentage of votes which were accepted after we had received a quorum of precommits

this currently exists for prevote: we have quorum_prevote_delay, but nothing for precommits.(

cometbft/internal/consensus/metrics.gen.go

Lines 159 to 164 in f4d33ab

    
           QuorumPrevoteDelay: prometheus.NewGaugeFrom(stdprometheus.GaugeOpts{ 
        
           	Namespace: namespace, 
        
           	Subsystem: MetricsSubsystem, 
        
           	Name:      "quorum_prevote_delay", 
        
           	Help:      "Interval in seconds between the proposal timestamp and the timestamp of the earliest prevote that achieved a quorum.", 
        
           }, append(labels, "proposer_address")).With(labelsAndValues...),

).

important:

How much stake and how many votes we accumulated during the timeout commit
How long it took to get certain percentages of the votes that came in during timeout commit

extra:

How long it took each node to get 2/3 stake precommits
How long the timeout commit phase is lasting on each node
How long it took to get certain percentages of the votes that came in during timeout commit

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	QuorumPrevoteDelay: prometheus.NewGaugeFrom(stdprometheus.GaugeOpts{
	Namespace: namespace,
	Subsystem: MetricsSubsystem,
	Name: "quorum_prevote_delay",
	Help: "Interval in seconds between the proposal timestamp and the timestamp of the earliest prevote that achieved a quorum.",
	}, append(labels, "proposer_address")).With(labelsAndValues...),

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