Add check_domain_availability function

[Josh-XT]

Summary

Adds a new check_domain_availability(domain: str) -> bool function to the essential_abilities extension that allows agents to check if a domain name is available for registration.

Changes

• Added new async function check_domain_availability to essential_abilities.py

Implementation Details

• Primary method: Uses the python-whois library to perform WHOIS lookups
• Fallback method: Falls back to DNS resolution check if python-whois is not installed
• Input validation: Validates domain format using regex, handles protocols (http/https), www prefix, and paths
• Return value: Returns True if domain is available, False if registered or on error
• Error handling: Comprehensive error handling with logging for debugging

Usage Example

# Check if a domain is available
available = await check_domain_availability("example.com")
# Returns False (domain is registered)

available = await check_domain_availability("some-unregistered-domain-12345.com")
# Returns True (domain is available)

Testing

• Function syntax validated with py_compile
• Follows existing code style and documentation patterns in the file

Dependencies

• Optionally uses python-whois library for accurate WHOIS lookups
• Falls back to built-in socket module for DNS-based checking if python-whois unavailable