feat: root group data source

[1riatsila1]

Description

Introduce root group data source and forbid importing root group as resource

Related Issue(s)

https://jira.arubanetworks.com/browse/UXI-8069

[codecov]

Codecov Report

Attention: Patch coverage is 80.48780% with 8 lines in your changes missing coverage. Please review.

Please upload report for BASE (main@b87fdf2). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
...g-api-provider/provider/data-sources/root_group.go	71.42%	7 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #17   +/-   ##
=======================================
  Coverage        ?   39.18%           
=======================================
  Files           ?       26           
  Lines           ?     2368           
  Branches        ?        0           
=======================================
  Hits            ?      928           
  Misses          ?     1324           
  Partials        ?      116           

Files with missing lines	Coverage Δ
pkg/config-api-provider/provider/provider.go	100.00% <100.00%> (ø)
...kg/config-api-provider/provider/resources/group.go	56.86% <100.00%> (ø)
pkg/config-api-provider/test/utils.go	100.00% <100.00%> (ø)
...g-api-provider/provider/data-sources/root_group.go	71.42% <71.42%> (ø)