Resolve CSV Asan "use after free" memory issues

[ShreyasKhandekar]

The recent changes to CSV reads were causing issues with ASAN testing where we were getting a "heap use after free" error message in both lscsv and get_info.

The offending code pattern was similar in both cases, even though the pattern itself looks pretty innocent.

This PR fixes the ASAN issues by rewriting the code to be a little more verbose and avoids the offending pattern.

When I have more time, I will try to see if we can reproduce this ASAN issue outside of Arkouda (i.e. if it's a problem on the Chapel side)

• [X] tests/io_test.py::IOTest::test_csv_read_write in ASAN+gasnet
• [x] tests/io_test.py::IOTest::test_csv_read_write in gasnet
• [x] tests/io_test.py::IOTest::test_csv_read_write in default