Added ability to handle multiple queries

[remade]

Added the ability to utilise SurrealDB multi-query capabilities. The raw results are returned and the user can directly unmarshal the result

Example:

queries := []surrealdb.QueryStmt{
    {SQL: "CREATE person SET name = 'John'"},
    {SQL: "SELECT * FROM type::table($tb)", Vars: map[string]interface{}{"tb": "person"}},
}

err := surrealdb.QueryRaw(s.db, &queries)
if err != nil {
    panic(err)
}

var created []testPerson
err = queries[0].GetResult(&created)
if err != nil {
    panic(err)
}

var selected []testPerson
err = queries[1].GetResult(&selected)
if err != nil {
    panic(err)
}

// fmt.Printf("%+v\n", created)
// fmt.Printf("%+v\n", selected)