Added new feature to print a text log to neteq_rtpplay

This will print out the major events during a NetEq simulation.

Bug: b/116685514
Change-Id: Iab172e9a9115695b42c67628d5523c727359bb89
Reviewed-on: https://webrtc-review.googlesource.com/c/114320
Commit-Queue: Ivo Creusen <ivoc@webrtc.org>
Reviewed-by: Björn Terelius <terelius@webrtc.org>
Reviewed-by: Henrik Lundin <henrik.lundin@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#26019}

modules/audio_coding/neteq/neteq_decoder_plc_unittest.cc

@@ -185,7 +185,7 @@ NetEqNetworkStatistics RunTest(int loss_cadence, std::string* checksum) {
   // No callback objects.
   NetEqTest::Callbacks callbacks;
 
-  NetEqTest neteq_test(config, decoders, external_decoders,
+  NetEqTest neteq_test(config, decoders, external_decoders, nullptr,
                        std::move(lossy_input), std::move(output), callbacks);
   EXPECT_LE(kRunTimeMs, neteq_test.Run());