Show estimated build end time during build

Ninja delivers estimated total build time and critical path time from
previous ninja log.

Bug: 292304818
Test: check if ETA shows
Change-Id: I014caaa3e8222a53c8822616b2ae31b88a3b0310

ui/terminal/smart_status.go

@@ -31,8 +31,9 @@ import (
 const tableHeightEnVar = "SOONG_UI_TABLE_HEIGHT"
 
 type actionTableEntry struct {
-	action    *status.Action
-	startTime time.Time
+	action           *status.Action
+	startTime        time.Time
+	estimatedEndTime time.Time
 }
 
 type smartStatusOutput struct {