Add random signal generators

Related to #168 (closed)

b_asic/signal_generator.py

@@ -224,7 +224,7 @@ class Gaussian(SignalGenerator):
             ret_list.append(f"loc={self._loc}")
         if self._scale != 1.0:
             ret_list.append(f"scale={self._scale}")
-        args = ",".join(ret_list)
+        args = ", ".join(ret_list)
         return f"Gaussian({args})"
 
 
@@ -264,7 +264,7 @@ class Uniform(SignalGenerator):
             ret_list.append(f"low={self._low}")
         if self._high != 1.0:
             ret_list.append(f"high={self._high}")
-        args = ",".join(ret_list)
+        args = ", ".join(ret_list)
         return f"Uniform({args})"