Add typed events and metrics to the metadata module

[iramiller]

Summary

Implement Typed Events for Metadata Module

Problem Definition

Typed Event Conversion

The SDK recently added support for typed events and deprecated the existing style of kv event attributes. This issue is for refactoring the existing events into proto messages and wiring up typed events to replace the existing ones.

• Replace Message Events with Typed Versions
• Ensure all Core Keeper functions that mutate state publish an associated typed event
  • Set
  • Remove

Metric Publishing

Tracking the volume of information being handled on chain and the duration of requests is an important part of monitoring the health of the blockchain. Metrics were add. Along with ensuring proper events are published the associated metrics should also be put in place. These two efforts are linked because they typically are inserted at the same point in the code for similar reasons.

• Being Blocker methods are appropriately timed defer telemetry.ModuleMeasureSince(types.ModuleName, time.Now(), telemetry.MetricKeyBeginBlocker)
• All creation, modification, and validation methods are timed defer telemetry.MeasureSince(time.Now(), "metadata", "validation|scope|specification", "get|set|validate|etc")
• Creation of new records are counted defer telemetry.IncrCounter(1, "new", "scope|record|specification")
• Gauge metrics are set of appropriate amount values (examples, mint/burn amounts, send amounts)
• Appropriate labels are applied to each counter, gauge

Example Metric and Events from staking module msg_server

	if msg.Amount.Amount.IsInt64() {
		defer func() {
			telemetry.IncrCounter(1, types.ModuleName, "delegate")
			telemetry.SetGaugeWithLabels(
				[]string{"tx", "msg", msg.Type()},
				float32(msg.Amount.Amount.Int64()),
				[]metrics.Label{telemetry.NewLabel("denom", msg.Amount.Denom)},
			)
		}()
	}

	ctx.EventManager().EmitEvents(sdk.Events{
		sdk.NewEvent(
			types.EventTypeDelegate,
			sdk.NewAttribute(types.AttributeKeyValidator, msg.ValidatorAddress),
			sdk.NewAttribute(sdk.AttributeKeyAmount, msg.Amount.Amount.String()),
		),
		sdk.NewEvent(
			sdk.EventTypeMessage,
			sdk.NewAttribute(sdk.AttributeKeyModule, types.AttributeValueCategory),
			sdk.NewAttribute(sdk.AttributeKeySender, msg.DelegatorAddress),
		),
	})

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For Admin Use

• Not duplicate issue
• Appropriate labels applied
• Appropriate contributors tagged
• Contributor assigned/self-assigned