Problem
The censys asm search CLI command's --fields and --sort arguments were broken and could not accept any values.

Root Cause: The argparse argument definitions used type=List[str], which is invalid. Argparse's type= parameter expects a callable (like str, int, float) that converts a string to the desired type. List[str] is a type hint, not a callable, causing argparse to fail when parsing any input.

Before this PR this command would fail

censys asm search --query "type: HOST" --fields host.services.port
usage: censys asm search [-h] [--api-key API_KEY] --query QUERY [--page-size PAGE_SIZE] [--cursor CURSOR] [--sort SORT]
                         [--fields FIELDS] [--workspaces WORKSPACES] [--pages PAGES] [-v]
censys asm search: error: argument --fields: invalid List value: 'host.services.port'

How to Test

1. Pull branch and install

cd censys-python
poetry install

2. Configure Credentials

poetry run censys asm config
# Enter your ASM API key when prompted

3. Try out the search command with fields filter

poetry run censys asm search --query "type: HOST" --fields host.services.port

4. Validate output is correct.