Plugin dnstap: add support for "extra" field in payload (#6226)

* dnstap: add 'extra' field

Signed-off-by: chenyuheng <chenyuheng99@qq.com>

* dnstap: add setup_test for 'extra' field

Signed-off-by: chenyuheng <chenyuheng99@qq.com>

* udnstap: update document and test

Signed-off-by: chenyuheng <chenyuheng99@qq.com>

* dnstap: update setup_test for more coverage

Signed-off-by: chenyuheng <chenyuheng99@qq.com>

* dnstap: add TapMessageWithMetadata function to Dnstap

Signed-off-by: chenyuheng <chenyuheng99@qq.com>

* dnstap: adapt dnstap and forward plugins to use TapMessageWithMetadata

Signed-off-by: chenyuheng <chenyuheng99@qq.com>

* change TapMessageWithMetadata function

Signed-off-by: chenyuheng <chenyuheng99@qq.com>

* tab inconsistency fix

Signed-off-by: chenyuheng <chenyuheng99@qq.com>

* fix replacer to support empty state

Signed-off-by: chenyuheng <chenyuheng99@qq.com>

* add replacer test for empty status parameter

Signed-off-by: chenyuheng <chenyuheng99@qq.com>

* dnstap: update unit test for 'extra' field

Signed-off-by: chenyuheng <chenyuheng99@qq.com>

* clean up code

Signed-off-by: chenyuheng <chenyuheng99@qq.com>

* gofmt fix & static analysis fix

Signed-off-by: chenyuheng <chenyuheng99@qq.com>

* dnstap: refactor

Signed-off-by: chenyuheng <chenyuheng99@qq.com>

---------

Signed-off-by: chenyuheng <chenyuheng99@qq.com>

plugin/dnstap/writer.go

@@ -1,9 +1,11 @@
 package dnstap
 
 import (
+	"context"
 	"time"
 
 	"github.com/coredns/coredns/plugin/dnstap/msg"
+	"github.com/coredns/coredns/request"
 
 	tap "github.com/dnstap/golang-dnstap"
 	"github.com/miekg/dns"
@@ -13,6 +15,7 @@ import (
 type ResponseWriter struct {
 	queryTime time.Time
 	query     *dns.Msg
+	ctx       context.Context
 	dns.ResponseWriter
 	Dnstap
 }
@@ -35,6 +38,7 @@ func (w *ResponseWriter) WriteMsg(resp *dns.Msg) error {
 	}
 
 	msg.SetType(r, tap.Message_CLIENT_RESPONSE)
-	w.TapMessage(r)
+	state := request.Request{W: w.ResponseWriter, Req: w.query}
+	w.TapMessageWithMetadata(w.ctx, r, state)
 	return nil
 }