feat: add role based permissions

[trufurs]

This pull request introduces several improvements to the wordpress_form_apis package, focusing on enhanced security for lead-related API endpoints and improved error handling. The main changes include role-based access control for sensitive API methods and more user-friendly error messages.

Security and Access Control:

• Added an ALLOWED_ROLES list (containing "Gravity Form") and enforced role-based access using frappe.only_for(ALLOWED_ROLES) in the upload_lead_file, get_lead_sources, and _filter_payload functions to ensure only authorized roles can access these endpoints. [1] [2]

Error Handling Improvements:

• Updated the error response in the create function to return a generic error message instead of the raw exception, and added frappe.clear_messages() to clear any previous messages.

Version Update:

• Bumped the package version from 1.0.1 to 1.0.2 in __init__.py to reflect these changes.