Add latency log for occ scheduler (#483)

## Describe your changes and provide context
This PR add latency and retries to occ scheduler log
## Testing performed to validate your change

tasks/scheduler.go

@@ -6,6 +6,7 @@ import (
 	"fmt"
 	"sort"
 	"sync"
+	"time"
 
 	"github.com/cosmos/cosmos-sdk/store/multiversion"
 	store "github.com/cosmos/cosmos-sdk/store/types"
@@ -260,6 +261,7 @@ func (s *scheduler) emitMetrics() {
 }
 
 func (s *scheduler) ProcessAll(ctx sdk.Context, reqs []*sdk.DeliverTxEntry) ([]types.ResponseDeliverTx, error) {
+	startTime := time.Now()
 	var iterations int
 	// initialize mutli-version stores if they haven't been initialized yet
 	s.tryInitMultiVersionStore(ctx)
@@ -321,7 +323,7 @@ func (s *scheduler) ProcessAll(ctx sdk.Context, reqs []*sdk.DeliverTxEntry) ([]t
 	}
 	s.metrics.maxIncarnation = s.maxIncarnation
 
-	ctx.Logger().Info("occ scheduler", "height", ctx.BlockHeight(), "txs", len(tasks), "maxIncarnation", s.maxIncarnation, "iterations", iterations, "sync", s.synchronous, "workers", s.workers)
+	ctx.Logger().Info("occ scheduler", "height", ctx.BlockHeight(), "txs", len(tasks), "latency_ms", time.Since(startTime).Milliseconds(), "retries", s.metrics.retries, "maxIncarnation", s.maxIncarnation, "iterations", iterations, "sync", s.synchronous, "workers", s.workers)
 
 	return s.collectResponses(tasks), nil
 }