[FEATURE] GetAllRuleCategories API

[petardz]

Is your feature request related to a problem?
Currently FE has all rule categories hardcoded.

What solution would you like?
We need capability for FE to fetch current rule categories from backend. We can implement new API GetAllRuleCategories which will return all categories enabled in backend:

GET /_plugins/_security_analytics/rules/categories

RESPONSE:

{
  "rule_categories": [
    {
      "key": "ad_ldap",
      "display_name": "AD/LDAP"
    },
    {
      "key": "dns",
      "display_name": "DNS logs"
    },
    {
      "key": "network",
      "display_name": "Network"
    },
    {
      "key": "apache_access",
      "display_name": "Apache access logs"
    },
    {
      "key": "cloudtrail",
      "display_name": "Cloud Trail logs"
    },
    {
      "key": "s3",
      "display_name": "S3 access logs"
    },
    {
      "key": "windows",
      "display_name": "Windows logs"
    },
    {
      "key": "linux",
      "display_name": "System logs"
    }
  ]
}

Response fields:

field	description
key	This value should be used as detectorType/ruleCategory param when calling APIs.(CreateDetector, SearchRules,...)
display_name	Used on UI as label text

[amsiglan]

What is the use case for the enabled field? Can there be disabled categories and is it configurable by the user?
Also, how are we determining which categories are enabled?

[petardz]

@amsiglan After discussion with @sbcd90 I removed "enabled" param