feat(atlas): implement comprehensive MongoDB Atlas alerting system

[d-teller]

Add complete alert configuration and management capabilities with both CLI and YAML ApplyDocument support. This feature provides critical monitoring and notification functionality for MongoDB Atlas infrastructure.

BREAKING CHANGE: None - This is a new feature addition.

• matlas atlas alerts list/get/acknowledge - Alert monitoring and management

• matlas atlas alert-configurations list/get/delete/matcher-fields - Configuration CRUD operations

• AlertConfiguration kind for declarative alert management

• Alert kind for read-only alert status information

• Full ApplyDocument integration with validation

• EMAIL, SMS, SLACK, PAGER_DUTY, OPS_GENIE, DATADOG

• MICROSOFT_TEAMS, WEBHOOK, USER, GROUP, TEAM

• EQUALS, NOT_EQUALS, CONTAINS, NOT_CONTAINS

• STARTS_WITH, ENDS_WITH, REGEX, NOT_REGEX

• MetricThreshold: CPU, memory, disk usage with AVERAGE/TOTAL modes

• GeneralThreshold: Simple numeric thresholds for events

• AlertsService: Alert operations (list, get, acknowledge)

• AlertConfigurationsService: Full CRUD for alert configurations

• Bidirectional conversion between internal and Atlas SDK types

• AlertConfig: Complete configuration structure

• AlertMatcher: Rule-based targeting system

• AlertNotification: Multi-channel notification support

• AlertMetricThreshold/AlertThreshold: Flexible threshold system

• Comprehensive field validation and type checking

• Enum validation for operators and notification types

• Range validation for thresholds and numeric fields

• internal/types/apply.go: Added KindAlert and KindAlertConfiguration

• internal/types/config.go: Alert configuration type definitions

• internal/services/atlas/alerts.go: Alert operations service

• internal/services/atlas/alert_configurations.go: Configuration service

• internal/apply/validation.go: Alert validation functions

• cmd/atlas/alerts/alerts.go: Alert management commands

• cmd/atlas/alerts/alert_configurations.go: Configuration commands

• cmd/atlas/atlas.go: Integration with main atlas command

• docs/alerts.md: Complete alerting documentation

• docs/examples/alerts.md: Usage examples and patterns

• examples/alert-*.yaml: 4 comprehensive example configurations

• features/2025-08-30-alerting-system.md: Feature specification

• scripts/test/alerts-lifecycle.sh: Comprehensive test suite

• .github/workflows/release.yml: Updated CI configuration

• Alert configuration CRUD operations

• All notification channel types and matcher operators

• Threshold configurations and validation

• YAML parsing and ApplyDocument integration

• Error handling and edge cases

• Baseline integrity verification

• Atlas Go SDK AlertConfigurationsApi and AlertsApi

• Full matlas infra apply/plan/diff/validate support

• Consistent CLI patterns and output formatting

• Environment variable support for sensitive credentials

Closes: Related to monitoring and alerting infrastructure requirements
Refs: Feature specification in features/2025-08-30-alerting-system.md

[github-actions]

🎉 This PR is included in version 2.0.0 🎉

The release is available on GitHub release

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