SilentLogger: silence duration messages

Summary:
We are getting a lot of noise from the VRS open progress logger, since we open a decent amount of VRS files.

Even if I silence it on the XR Input side, I noticed that I was still getting duration messages. This just makes it so SilentLogger also silences duration messages

Reviewed By: georges-berenger

Differential Revision: D53141868

fbshipit-source-id: f080a464358b8ab7d7176e800dfa862650864167

vrs/ProgressLogger.h

@@ -133,6 +133,9 @@ class SilentLogger : public ProgressLogger {
   bool logStatus(const string&, int = 0) override {
     return true;
   }
+  bool logDuration(const string& operationName, double duration, int precision = 1) override {
+    return true;
+  }
 };
 
 } // namespace vrs