[FEATURE] Add specs for `security_analytics` namespace

[nhtruong]

Part of Adding missing API specs issue

• /_plugins/_security_analytics/alerts: ["GET"]
• /_plugins/_security_analytics/correlation/rules: ["POST"]
• /_plugins/_security_analytics/correlation/rules/_search: ["POST"]
• /_plugins/_security_analytics/correlation/rules/{correlation_rule_id}: ["PUT","DELETE"]
• /_plugins/_security_analytics/correlations: ["GET"]
• /_plugins/_security_analytics/detectors: ["POST"]
• /_plugins/_security_analytics/detectors/_search: ["POST"]
• /_plugins/_security_analytics/detectors/{detector_id}: ["GET","PUT","DELETE"]
• /_plugins/_security_analytics/detectors/{detector_id}/_acknowledge/alerts: ["POST"]
• /_plugins/_security_analytics/findings/_search: ["GET"]
• /_plugins/_security_analytics/findings/correlate: ["GET"]
• /_plugins/_security_analytics/logtype: ["POST"]
• /_plugins/_security_analytics/logtype/_search: ["GET","POST"]
• /_plugins/_security_analytics/logtype/{custom_logtype_id}: ["PUT","DELETE"]
• /_plugins/_security_analytics/mappings: ["GET","PUT","POST"]
• /_plugins/_security_analytics/mappings/view: ["GET"]
• /_plugins/_security_analytics/rules: ["POST"]
• /_plugins/_security_analytics/rules/_search: ["POST"]
• /_plugins/_security_analytics/rules/categories: ["GET"]
• /_plugins/_security_analytics/rules/validate: ["POST"]
• /_plugins/_security_analytics/rules/{ruleID}: ["PUT","DELETE"]