feat: First stab at urwid UI & async

[bmtcril]

Features / Changes

• Adds new backends using asyncio for ClickHouse direct, Ralph, CSV, and CHDB/S3 using a new task management system
• Adds an urwid based UI for displaying the load state as the various loads happen
• Unpins clickhouse-connect as it's no longer needed
• Adds type hinting across the application

Breaking Changes

Refactors several configuration variables:

• num_batches is renamed to num_xapi_batches to clarify it's scope
• num_workers is added and required
• csv_load_from_s3_after is renamed to load_from_s3_after as it is now shared with the CHDB backend

Refactors backend names, the available backends are now:

• chdb
• csv
• clickhouse
• ralph

Removes the load_db_from_s3 command in favor of a new --load_db_only flag on load_db that fulfills the same behavior

Todo

• Documentation
• Improve test coverage, especially in the UI
• Test in tutor-contrib-aspects
• Update the example configs and make sure they all still work
• Add chdb example config

Testing

• Any existing config can be updated by changing the backend name, renaming num_batches to num_xapi_batches and adding num_workers: 4
• To test the UI, use the new command xapi-db-load ui --config_file <path to your config>
• The default config should also work
• To test the command line interface xapi-db-load load_db --config_file <path to your config> should still work

The new CHDB backend writes lz4 compressed ClickHouse native files to S3 then optionally loads them to ClickHouse by running insert commands on ClickHouse, similar to how the CSV backend works. However it does not currently support writing the files anywhere but S3.

[saraburns1]

looks good - ran with ralph & clickhouse backends through tutor-contrib-aspects. will approve after conflicrts are resolved