feat: implement SNMP provider with v3 and walk support (#2112)

[dei96303-boop]

Description

This PR introduces a comprehensive SNMP (Simple Network Management Protocol) Provider to the Keep platform. It is designed to monitor network devices with support for modern security protocols and bulk data retrieval.

Key Changes

• Multi-Version Support: Full support for SNMP v1, v2c, and v3.
• Advanced Security: Implemented SNMP v3 User Security Model (USM) including AuthProtocol (MD5/SHA) and PrivProtocol (AES/DES) for encrypted communication.
• Polling & Walk: Supports both standard GET requests and Walk operations (lexicographical subtree retrieval) for monitoring entire device tables.
• Documentation: Manually added the snmp-snippet-autogenerated.mdx to fix the CI/CD documentation rendering issue as I am contributing from a mobile environment.

Files Added/Modified

• keep/providers/snmp_provider/snmp_provider.py: Core logic for the provider.
• keep/providers/snmp_provider/requirements.txt: Added pysnmp-lextudio.
• docs/snippets/providers/snmp-snippet-autogenerated.mdx: Configuration snippet for documentation.

Related Issue

Fixes #2112

Checklist

• Implemented SNMP v1/v2c/v3 support.
• Added support for SNMP Walk operations.
• Fixed documentation snippet generation error.
• Verified code follows Keep's provider structure.
• Signed the CLA.

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