feat: add SNMP provider

[zekebawt]

This PR implements an SNMP provider to receive SNMP traps as alerts in Keep.

Summary

Webhook-based SNMP provider that ingests SNMP v1/v2c/v3 traps and converts them to Keep alerts.

Features

• 🌐 Multi-version support: SNMP v1, v2c, and v3
• 🎯 Smart severity mapping: Automatic severity detection from trap types, OIDs, and varbinds
• ✅ Status detection: Automatic firing/resolved status from trap types (linkUp/linkDown)
• 📦 Varbind parsing: Full support for SNMP variable bindings
• 🔧 Standard trap support: coldStart, warmStart, linkDown, linkUp, authenticationFailure, egpNeighborLoss
• 🧪 Comprehensive tests: 17 test cases covering various SNMP scenarios

Supported Trap Types

• Standard SNMPv1 traps (coldStart, warmStart, linkDown, linkUp, authenticationFailure, egpNeighborLoss)
• Enterprise-specific traps
• Cisco, Juniper, and other vendor traps

Example Webhook Payload

curl -X POST ''https://api.keephq.dev/alerts/event/snmp'\'
-H ''Content-Type: application/json''
-H ''X-API-KEY: your-api-key''
-d ''{
''''version'''': ''''v2c'''',
''''community'''': ''''public'''',
''''enterprise'''': ''''1.3.6.1.4.1.8072.2.3'''',
''''agentAddress'''': ''''192.168.1.100'''',
''''trapType'''': ''''enterpriseSpecific'''',
''''specificTrap'''': 1,
''''uptime'''': ''''123456789'''',
''''varbinds'''': {
''''1.3.6.1.4.1.8072.2.3.2.1'''': ''''Test message''''
}
}''

Test Coverage

• Basic trap parsing
• Link up/down trap detection
• Varbind extraction
• Severity mapping (explicit fields and OID inference)
• Status detection
• Cisco-specific traps
• SNMPv3 support
• Alert ID uniqueness
• Description formatting

Closes #2112

/claim #2112

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