Feature: Add support for multidimensional array or dicts for Apply For

[jseifeddine]

Would be great to have support for multidimensional array or dicts for Apply For in Service Apply Rules

Current, only an single dimensional array is possible via director

Related: https://community.icinga.com/t/apply-rule-on-multidimensional-array/11278 https://community.icinga.com/t/service-apply-rules-with-array-variable/8613/8

Example, without director https://community.icinga.com/t/reach-multi-dimensional-array-defined-in-host-object-from-checkcommand/2658/2