[manifest] Include all data files

MANIFEST.in

@@ -3,4 +3,5 @@
 # SPDX-License-Identifier: GPL-3.0-or-later
 
 recursive-include doc *.rst *.ico *.png
-recursive-include tests *.py
+recursive-include tests *.py *.png *.csv *.json
+recursive-include src/ptbench/data *.json.bz2