table: fix data race in select builder usage

When table is used with SelectBuilder it triggers data race on Where()
condition usage.

This change copies underlining slices on table creation to allow safe
concurrent usage of the table.

table/table.go

@@ -45,7 +45,8 @@ func New(m Metadata) *Table { // nolint: gocritic
 	for _, k := range m.SortKey {
 		t.primaryKeyCmp = append(t.primaryKeyCmp, qb.Eq(k))
 	}
-	t.partKeyCmp = t.primaryKeyCmp[:len(t.metadata.PartKey)]
+	t.partKeyCmp = make([]qb.Cmp, len(m.PartKey))
+	copy(t.partKeyCmp, t.primaryKeyCmp[:len(t.metadata.PartKey)])
 
 	// prepare get stmt
 	t.get.stmt, t.get.names = qb.Select(m.Name).Where(t.primaryKeyCmp...).ToCql()