improve 04-channel logging (cosmos#692)

## Description



closes: cosmos#674 

---

Before we can merge this PR, please make sure that all the following items have been
checked off. If any of the checklist items are not applicable, please leave them but
write a little note why.

- [x] Targeted PR against correct branch (see [CONTRIBUTING.md](https://github.com/cosmos/ibc-go/blob/master/CONTRIBUTING.md#pr-targeting))
- [x] Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
- [x] Code follows the [module structure standards](https://github.com/cosmos/cosmos-sdk/blob/master/docs/building-modules/structure.md).
- [x] Wrote unit and integration [tests](https://github.com/cosmos/ibc-go/blob/master/CONTRIBUTING.md#testing)
- [x] Updated relevant documentation (`docs/`) or specification (`x/<module>/spec/`)
- [x] Added relevant `godoc` [comments](https://blog.golang.org/godoc-documenting-go-code).
- [x] Added a relevant changelog entry to the `Unreleased` section in `CHANGELOG.md`
- [x] Re-reviewed `Files changed` in the Github PR explorer
- [x] Review `Codecov Report` in the comment section below once CI passes

CHANGELOG.md

@@ -53,6 +53,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 ### Improvements
 
+* (channel) [\#692](https://github.com/cosmos/ibc-go/pull/692) Minimize channel logging by only emitting the packet sequence, source port/channel, destination port/channel upon packet receives, acknowledgements and timeouts.
 * [\#383](https://github.com/cosmos/ibc-go/pull/383) Adds helper functions for merging and splitting middleware versions from the underlying app version.
 * (modules/core/05-port) [\#288](https://github.com/cosmos/ibc-go/issues/288) Making the 05-port keeper function IsBound public. The IsBound function checks if the provided portID is already binded to a module.
 * (channel) [\#644](https://github.com/cosmos/ibc-go/pull/644) Adds `GetChannelConnection` to the ChannelKeeper. This function returns the connectionID and connection state associated with a channel. 

modules/core/04-channel/keeper/packet.go

@@ -2,7 +2,6 @@ package keeper
 
 import (
 	"bytes"
-	"fmt"
 	"time"
 
 	sdk "github.com/cosmos/cosmos-sdk/types"
@@ -135,6 +134,7 @@ func (k Keeper) SendPacket(
 		"dst_port", packet.GetDestPort(),
 		"dst_channel", packet.GetDestChannel(),
 	)
+
 	return nil
 }
 
@@ -281,7 +281,14 @@ func (k Keeper) RecvPacket(
 	}
 
 	// log that a packet has been received & executed
-	k.Logger(ctx).Info("packet received", "packet", fmt.Sprintf("%v", packet))
+	k.Logger(ctx).Info(
+		"packet received",
+		"sequence", packet.GetSequence(),
+		"src_port", packet.GetSourcePort(),
+		"src_channel", packet.GetSourceChannel(),
+		"dst_port", packet.GetDestPort(),
+		"dst_channel", packet.GetDestChannel(),
+	)
 
 	// emit an event that the relayer can query for
 	EmitRecvPacketEvent(ctx, packet, channel)
@@ -345,7 +352,14 @@ func (k Keeper) WriteAcknowledgement(
 	)
 
 	// log that a packet acknowledgement has been written
-	k.Logger(ctx).Info("acknowledged written", "packet", fmt.Sprintf("%v", packet))
+	k.Logger(ctx).Info(
+		"acknowledgement written",
+		"sequence", packet.GetSequence,
+		"src_port", packet.GetSourcePort(),
+		"src_channel", packet.GetSourceChannel(),
+		"dst_port", packet.GetDestPort(),
+		"dst_channel", packet.GetDestChannel(),
+	)
 
 	EmitWriteAcknowledgementEvent(ctx, packet, channel, acknowledgement)
 
@@ -472,7 +486,14 @@ func (k Keeper) AcknowledgePacket(
 	k.deletePacketCommitment(ctx, packet.GetSourcePort(), packet.GetSourceChannel(), packet.GetSequence())
 
 	// log that a packet has been acknowledged
-	k.Logger(ctx).Info("packet acknowledged", "packet", fmt.Sprintf("%v", packet))
+	k.Logger(ctx).Info(
+		"packet acknowledged",
+		"sequence", packet.GetSequence,
+		"src_port", packet.GetSourcePort(),
+		"src_channel", packet.GetSourceChannel(),
+		"dst_port", packet.GetDestPort(),
+		"dst_channel", packet.GetDestChannel(),
+	)
 
 	// emit an event marking that we have processed the acknowledgement
 	EmitAcknowledgePacketEvent(ctx, packet, channel)

modules/core/04-channel/keeper/timeout.go

@@ -2,7 +2,6 @@ package keeper
 
 import (
 	"bytes"
-	"fmt"
 
 	sdk "github.com/cosmos/cosmos-sdk/types"
 	sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
@@ -157,7 +156,14 @@ func (k Keeper) TimeoutExecuted(
 		k.SetChannel(ctx, packet.GetSourcePort(), packet.GetSourceChannel(), channel)
 	}
 
-	k.Logger(ctx).Info("packet timed-out", "packet", fmt.Sprintf("%v", packet))
+	k.Logger(ctx).Info(
+		"packet timed-out",
+		"sequence", packet.GetSequence(),
+		"src_port", packet.GetSourcePort(),
+		"src_channel", packet.GetSourceChannel(),
+		"dst_port", packet.GetDestPort(),
+		"dst_channel", packet.GetDestChannel(),
+	)
 
 	// emit an event marking that we have processed the timeout
 	EmitTimeoutPacketEvent(ctx, packet, channel)