Add documents for datax in extension catalog. Add documents for sampes in best-practice catalog.
make doriswriter of DataX support format csv. Format csv is more simple and faster than format json when data is simple add property format: csv/json add property column_separator: effect when format is csv, for example "\x01" , "^", etc...
1. Use `read_json_by_line` to load data 2. Use FE http server as the target host of stream load
This CL only add the script for building DataX development environment
