EPIC: Deephaven server from python library follow-up

[niloc132]

Follow up for #2221, to let that be closed when the work is finished

• Flexible "scope" support, rather than polling values from globals(). A specific "queryscope" object would be more pythonic, though perhaps harder to work with for most exploratory workflows
• ScriptSession API to ensure snapshots/diffs of bindings are always consistent. #4145
• Establish what configuration is possible/feasible for the jvm and deephaven's configuration, define a @dataclass for those details.
• Revisit how logs are handled, redirected, displayed, to be sure that if the web console is used at all, it sees what it would expect to see.

[chipkent]

I've created a repo to launch Deephaven as a Python library, while we wait for a full production version.
https://github.com/chipkent/test-dhaal

Everything is working, so no complaints.