fix(ubsan): MCOL-5844 - iron out UBSAN reports

The most important fix here is the fix of possible buffer overrun in
DATEFORMAT() function. A "%W" format, repeated enough times, would
overflow the 256-bytes buffer for result. Now we use ostringstream to
construct result and we are safe.

Changes in date/time projection functions made me fix difference between
us and server behavior. The new, better behavior is reflected in changes
in tests' results.

Also, there was incorrect logic in TRUNCATE() and ROUND() functions in
computing the decimal "shift."

utils/loggingcpp/messageobj.h

@@ -65,6 +65,14 @@ class Message
      */
     void add(uint64_t i);
 
+    /* define types to not to include mcs_numeric_limits.h */
+    using int128_t = __int128;
+    using uint128_t = unsigned __int128;
+
+    /** @brief add an 128 bit int arg to the message
+     */
+    void add(int128_t i128);
+
     /** @brief add a float arg to the message
      */
     void add(double d);