V1 Update Metrics Exporter and deprecate SnapshotDelegation

[thomaspanf]

• Removed all traces of SnapshotDelegation
• Updated the metrics-exporter.go and snapshot-collector.go to support the new voting system.

These are the values passed into Grafana:

	channel <- collector.activeProposals
	channel <- collector.closedProposals
	channel <- collector.votesActiveProposals
	channel <- collector.votesClosedProposals
	channel <- collector.nodeVotingPower
	channel <- collector.delegateVotingPower

No changes were needed for activeProposals and closedProposals. votesActiveProposals and votesClosedProposals should display the correct info now that collector.delegateAddress is replaced with collector.signallingAddress.

We use propMgr.GetArtifactsForVoting(blockNumber, address) and pass the node address or on-chain delegate address to grab nodeVotingPower and delegateVotingPower, similarly to how it's done in rp pdao status

One thing we could do is remove the if time.Since(timestamp)>= hoursToWait check on the voting power calls and have it run every 5 minutes alongside the task loop. It doesn't make calls to the Snapshot API so I think this is okay.

[0xfornax]

One thing we could do is remove the if time.Since(timestamp)>= hoursToWait check on the voting power calls and have it run every 5 minutes alongside the task loop. It doesn't make calls to the Snapshot API so I think this is okay.

I think it could be confusing to have a few fields of the Governance tab update faster and others take hours. Think it's ok to keep it as it is.