feat: make SOAR SSL verification configurable

[dandye]

Summary

This PR adds the ability to configure SSL/TLS verification for the SecOps SOAR MCP server. This is useful as a last resort for environments with self-signed certificates or proxy-level TLS interception.

Changes

• http_client.py: Updated HttpClient to use aiohttp's ssl parameter instead of verify. Restored ssl_verify parameter in request methods.
• bindings.py: Added logic to read SOAR_SSL_VERIFY from environment variables (defaults to true). Handles string-to-bool conversion.
• consts.py: Added ENV_SOAR_SSL_VERIFY constant.
• pyproject.toml: Added certifi dependency.

Usage

Set the environment variable SOAR_SSL_VERIFY=false to disable certificate verification (only for the SOAR API URL).