feat: Implement feed file data ingest

[crossjam]

This PR implements the subcommand for Usage: prompthound [OPTIONS] COMMAND [ARGS]...

A command-line tool for interacting with the prompthound package.

Options:
--log-level [TRACE|DEBUG|INFO|SUCCESS|WARNING|ERROR|CRITICAL]
Set the log level for the command.
[default: WARNING]
--log-file FILE Path to a file for logging.
--help Show this message and exit.

Commands:
init Initialize the prompthound database.
main The main entry point for the prompthound CLI. as described in GitHub issue #4.

Task Checklist

• 1. Create subcommand:

  • Add an subcommand to .
  • The subcommand should accept a list of filenames as arguments.
  • The subcommand should be able to read from if no filenames are provided.
  • Add a option to specify the database path.

• 2. Implement Database Handling:

  • Use a default database path of in the appropriate user data directory.
  • If the database file specified by exists, prompt the user for confirmation before overwriting.
  • Initialize the database schema if the database is new or overwritten.

• 3. Implement Ingestion Logic:

  • Read and parse feed data from files or .
  • Use the library to ingest the data.
  • Ensure that feed items are inserted only once to prevent duplicates.

• 4. Add Error Handling:

  • Implement error handling for file I/O operations.
  • Implement error handling for database operations.
  • Implement error handling for feed parsing.

• 5. Create Tests:

  • Add unit tests for the subcommand.
  • Test reading from files.
  • Test reading from .
  • Test the option.
  • Test overwriting an existing database.
  • Test with the existing test data in .
  • Test duplicate feed item handling.