Python bindings: Add a set of tests for the bindings

tests/python/common.py

tests/python/test_block.py

tests/python/test_block_table.py

tests/python/test_cdns_decoder.py

tests/python/test_cdns_encoder.py

tests/python/test_cdns_exporter.py

tests/python/test_cdns_reader.py

tests/python/test_file_preamble.py

tests/python/test_timestamp.py

tests/python/test_writer.py