Implement chdb v3.0 Connect method

[agoncear-mwb]

This pr implements the new statefull session created in the v3.0.0 release.

For backward compatibility, at the moment, i kept the old session mechanism still avaiable, but i guess in future release we can remove it in favor of the new ChdbConnection which is equivalent in methods but handle the connection with the underlying clickhouse local in a better way.

[auxten]

The old impl of query and the new one can not co-exist in one process.
As the new one need to keep some global stuff, but the old one tend to cleanup everything on finished.

[auxten]

@agoncear-mwb are you still working on this?

We should use the Connection base queryConn here instead.
And the Query should also use the the Connection base queryConn
See also: https://github.com/chdb-io/chdb/blob/d26d2ce84190e9f9e2dbbde024ac09e9739198eb/chdb/__init__.py#L75

[agoncear-mwb]

ok, so we should remove the old one?
I'll have a double check today, and push the mods ASAP

[auxten]

We need to try our best to keep the user side API stable, so the plan is:

• use the new connect based API to impl the sessioned query
• for stateless query, you can refer to the python binding:
  https://github.com/chdb-io/chdb/blob/d26d2ce84190e9f9e2dbbde024ac09e9739198eb/chdb/__init__.py#L75

[agoncear-mwb]

Perfect, i'll try to keep the implementation as close as possible with the python binding