test data: https://data.gharchive.org/2020-11-13-18.json.gz, 2GB, 197696 lines
before: String 13s vs. JSONB 28s
after: String 13s vs. JSONB 16s
**NOTICE: simdjson need to be patched since BOOL is conflicted with a macro BOOL defined in odbc sqltypes.h**
1. change jsonb_extract_string behavior: convert to string instead of NULL if the type of json path is not string
2. move jsonb tutorial doc to JSONB data type
