enh(stream): use same name rule with schemaless

test:add testcase of python connector using Statement API

Test-NetConnection command is wrong

feat: drop dnode

docs: python rest example

fix(stream): msg deserialize

feat: support delete data

refactor(stream): distributed execution

enh: support more json filter case

fix(os): add win32 monitor case

fix: error in json and add test cases for json

fix(query): check array length before generating the retention string .

feat: balance vgroup