add a flag of fuzzy_parse, if the json file all object keys are the same and has same order, we only need to parse the first row, and then use index instead key to parse value
This CL mainly changes:
1. Reorganized the code logic to limit the supported json format to two, and the import behavior is more consistent.
2. Modified the statistical behavior of the number of error rows when loading in json format, so that the error rows can be counted correctly.
3. See `load-json-format.md` to get details of loading json format.
