Add option to trace to run modules (GH-5134)

Adds a new option in trace that allows tracing runnable modules. It is
exposed as `--module module_name` as `-m` is already in use for another
argument.
diff --git a/Doc/library/trace.rst b/Doc/library/trace.rst
index 5cb7029..85fec68 100644
--- a/Doc/library/trace.rst
+++ b/Doc/library/trace.rst
@@ -42,6 +42,9 @@
 
    Display the version of the module and exit.
 
+.. versionadded:: 3.8
+    Added ``--module`` option that allows to run an executable module.
+
 Main options
 ^^^^^^^^^^^^