Add task queue to RtpRtcpInterface::Configuration.

Let ModuleRtpRtcpImpl2 use the configured value instead of
TaskQueueBase::Current().

Intention is to allow construction of RtpRtcpImpl2 on any thread.
If a task queue is provided (required for periodic rtt updates), the
destruction of the object must be done on that same task queue.

Also, delete ModuleRtpRtcpImpl2::Create, callers updated to use std::make_unique.

Bug: None
Change-Id: I412b7b1e1ce24722ffd23d16aa6c48a7214c9bcd
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/199968
Reviewed-by: Sebastian Jansson <srte@webrtc.org>
Reviewed-by: Sam Zackrisson <saza@webrtc.org>
Reviewed-by: Danil Chapovalov <danilchap@webrtc.org>
Reviewed-by: Ilya Nikolaevskiy <ilnik@webrtc.org>
Commit-Queue: Niels Moller <nisse@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#32949}

modules/rtp_rtcp/source/rtcp_sender_unittest.cc

@@ -92,7 +92,7 @@ class RtcpSenderTest : public ::testing::Test {
         receive_statistics_(ReceiveStatistics::Create(&clock_)),
         retransmission_rate_limiter_(&clock_, 1000) {
     RtpRtcpInterface::Configuration configuration = GetDefaultConfig();
-    rtp_rtcp_impl_.reset(new ModuleRtpRtcpImpl2(configuration));
+    rtp_rtcp_impl_ = std::make_unique<ModuleRtpRtcpImpl2>(configuration);
   }
 
   RtpRtcpInterface::Configuration GetDefaultConfig() {