Add CLI support for running blockwise tasks

[JoeStrout]

Summary

• Adds a run subcommand to volara-cli for running blockwise tasks directly from the command line, with
  support for YAML/JSON config files, dotted keys for nested fields, multi-value arguments, and shorthand
  expansion for nested Pydantic models.
• Adds a CLI tutorial (with some small helper scripts for preparing & visualizing the data).
• Fixes SQLite db code to read edge_attrs from stored metadata when not explicitly provided, avoiding assertion
  errors when reopening existing databases. (This lets us use the --db shorthand requested in issue Add CLI support #3.)

Details

• Config files and CLI args can be mixed (CLI overrides config).
• Shorthands: --db my.sqlite expands to {"db_type": "sqlite", "path": "my.sqlite"}
• volara-cli run --help lists all available task types.
• Added 32 new tests for config loading, arg parsing, shorthand resolution, and CLI integration.

Closes #3.