Prepare 0.3.2#777

Merged

zhicwu merged 6 commits intoClickHouse:developfrom

zhicwu:enhance-jdbc

Dec 21, 2021

Commits on Dec 13, 2021

Separate thread pool for I/O, add more tests for streaming, along with other minor changes for code clean up
zhicwu
committed

Commits on Dec 14, 2021

Bump slf4j and remove log4j dependency
zhicwu
committed

Commits on Dec 15, 2021

Make HttpUrlConnection default implementation
zhicwu
committed

Commits on Dec 21, 2021