Better API

[tephrocactus]

1. Support API v2 of CHDB.
2. Do less allocations during FFI calls within session context.
3. Allow to pass any arguments to Session and queries.
4. Enums for arguments, input/output formats, log-level.
5. Better API for dealing with query result.
6. Tests as examples.

[CLAassistant]

All committers have signed the CLA.