Implement check result package

[lazyfrosch]

Enhance result.overall to allow deeper hierarchy and better structure.

Maybe build a check result, and combinable package.

See also

• https://github.com/Icinga/icinga-powershell-framework/blob/master/doc/developerguide/01-New-IcingaCheck.md
• https://github.com/Icinga/icinga-powershell-framework/blob/master/doc/developerguide/02-New-IcingaCheckPackage.md

[RincewindsHat]

Started something in https://github.com/NETWAYS/go-check/tree/Introduce_subchecks

[RincewindsHat]

Is implemented, closing this.