core: Implement channel tracing for some events

Includes 
- API plumbing for channel tracing `+ManagedChannelBuilder.maxTraceEvents()`
- trace logging for channel/subchannel creation events and name resolving events.

Trace logging for all other events will be added in subsequent PRs.

1 files changed, 2 insertions, 2 deletions

diff --git a/services/src/test/java/io/grpc/services/ChannelzProtoUtilTest.java b/services/src/test/java/io/grpc/services/ChannelzProtoUtilTest.java
index c6214cabf..69dca80c5 100644
--- a/services/src/test/java/io/grpc/services/ChannelzProtoUtilTest.java
+++ b/services/src/test/java/io/grpc/services/ChannelzProtoUtilTest.java
@@ -861,12 +861,12 @@ public final class ChannelzProtoUtilTest {
     Event event1 = new Event.Builder()
         .setDescription("event1")
         .setSeverity(Severity.CT_ERROR)
-        .setTimestampNaonos(12)
+        .setTimestampNanos(12)
         .setSubchannelRef(subchannel)
         .build();
     Event event2 = new Event.Builder()
         .setDescription("event2")
-        .setTimestampNaonos(34)
+        .setTimestampNanos(34)
         .setSeverity(Severity.CT_INFO)
         .setChannelRef(channel)
         .build();