bpo-31574: importlib dtrace (#3749)

Importlib was instrumented with two dtrace probes to profile import timing.

Signed-off-by: Christian Heimes <christian@python.org>
diff --git a/Include/pydtrace.d b/Include/pydtrace.d
index 8836055..a6a5e7e 100644
--- a/Include/pydtrace.d
+++ b/Include/pydtrace.d
@@ -10,6 +10,8 @@
     probe line(const char *, const char *, int);
     probe gc__start(int);
     probe gc__done(long);
+    probe import__find__load__start(const char *);
+    probe import__find__load__done(const char *, int);
 };
 
 #pragma D attributes Evolving/Evolving/Common provider python provider