enhance: add python udf sample that uses numpy

tests/script/tsim/query/udfpy.sim

@@ -38,7 +38,6 @@ else
 endi
 sql create function pybitand as '/tmp/pyudf/pybitand.py' outputtype int language 'python';
 sql create aggregate function pyl2norm as '/tmp/pyudf/pyl2norm.py' outputtype double bufSize 128 language 'python';
-sql create aggregate function pycumsum as '/tmp/pyudf/pycumsum.py' outputtype double bufSize 128 language 'python';
 
 sql show functions;
 if $rows != 4 then
@@ -282,9 +281,17 @@ if $data20 != 8.000000000 then
   return -1
 endi
 
+sql create aggregate function pycumsum as '/tmp/pyudf/pycumsum.py' outputtype double bufSize 128 language 'python';
 sql select pycumsum(f2) from udf.t2
 print ======= pycumsum
 print $rows $data00
+if $rows != 1 then
+  return -1
+endi
+if $data00 != 20.000000000 then
+  return -1
+endi
+sql drop function pycumsum
 
 sql create or replace function bit_and as '/tmp/udf/libbitand.so' outputtype int
 sql select func_version from information_schema.ins_functions where name='bit_and'