Fix blob function usage

In the PR [1] with the switch from 'rune-0.12' to 'rune-0.13'
the 'blob' function changed it's return type from 'rune::runtime::Bytes'
to the 'Vec<u8>'.
Such a change required also an update to the input values parser
to expect one more input type match to the 'ColumnType::Blob'.

So, add the missing parsing element to make the 'blob' function work
again as it was before.
It will allow to avoid manual wrapping into the
'rune::runtime::Bytes' type in rune scripts.

[1] pkolaczk#96

src/scripting/bind.rs

@@ -67,6 +67,13 @@ fn to_scylla_value(v: &Value, typ: &ColumnType) -> Result<CqlValue, CassError> {
             }
         }
         (Value::Bytes(v), ColumnType::Blob) => Ok(CqlValue::Blob(v.borrow_ref().unwrap().to_vec())),
+        (Value::Vec(v), ColumnType::Blob) => {
+            let v: Vec<Value> = v.borrow_ref().unwrap().to_vec();
+            let byte_vec: Vec<u8> = v.into_iter()
+                .map(|value| value.as_byte().unwrap())
+                .collect();
+            Ok(CqlValue::Blob(byte_vec))
+        }
         (Value::Option(v), typ) => match v.borrow_ref().unwrap().as_ref() {
             Some(v) => to_scylla_value(v, typ),
             None => Ok(CqlValue::Empty),