LibSQL+SQLServer: Implement first cut of SELECT ... ORDER BY foo

Ordering is done by replacing the straight Vector holding the query
result in the SQLResult object with a dedicated Vector subclass that
inserts result rows according to their sort key using a binary search.
This is done in the ResultSet class.

There are limitations:
- "SELECT ... ORDER BY 1" (or 2 or 3 etc) is supposed to sort by the
n-th result column. This doesn't work yet
- "SELECT ... column-expression alias ... ORDER BY alias" is supposed to
sort by the column with the given alias. This doesn't work yet

What does work however is something like
```SELECT foo FROM bar SORT BY quux```
i.e. sorted by a column not in the result set. Once functions are
supported it should be possible to sort by random functions.

Userland/Services/SQLServer/SQLStatement.cpp

@@ -104,7 +104,7 @@ void SQLStatement::next()
         return;
     }
     if (m_index < m_result->results().size()) {
-        auto& tuple = m_result->results()[m_index++];
+        auto& tuple = m_result->results()[m_index++].row;
         client_connection->async_next_result(statement_id(), tuple.to_string_vector());
         deferred_invoke([this]() {
             next();