The goals of this task are as follows:

1. Update writeValueToStream() to actually print out the contents of a bsonBinData (instead of just printing out "---===*** bsonBinData ***===—"), similar to what BSONElement::toString() does.
2. Update writeValueToStream() to truncate StringBig, bsonString, and bsonBinData values, similar to what BSONElement::toString() does.
3. If appropriate, add a unittest to test out using writeValueToStream() to print out StringSmall, StringBig, bsonString, and bsonBinData values.