channeldb: save channel status on channel close

Add an optional channel status CloseChannel which will be stored on the
hitsorical channel which is persisted at channel close. This status is
used to set the close initiator for channels that do not complete the
funding flow or we abandon. In follow up commits, this status will be
used to record force and breach closes. The value is written to the
historical channel bucket for diplay over rpc.

channeldb/channel_test.go

@@ -1357,3 +1357,39 @@ func TestCloseInitiator(t *testing.T) {
 		})
 	}
 }
+
+// TestCloseChannelStatus tests setting of a channel status on the historical
+// channel on channel close.
+func TestCloseChannelStatus(t *testing.T) {
+	cdb, cleanUp, err := makeTestDB()
+	if err != nil {
+		t.Fatalf("unable to make test database: %v",
+			err)
+	}
+	defer cleanUp()
+
+	// Create an open channel.
+	channel := createTestChannel(
+		t, cdb, openChannelOption(),
+	)
+
+	if err := channel.CloseChannel(
+		&ChannelCloseSummary{
+			ChanPoint: channel.FundingOutpoint,
+			RemotePub: channel.IdentityPub,
+		}, ChanStatusRemoteCloseInitiator,
+	); err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+
+	histChan, err := channel.Db.FetchHistoricalChannel(
+		&channel.FundingOutpoint,
+	)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+
+	if !histChan.HasChanStatus(ChanStatusRemoteCloseInitiator) {
+		t.Fatalf("channel should have status")
+	}
+}