Add Azure plugin

[ricoberger]

• I added a CHANGELOG entry for this change.
• I adjusted the corresponding documentation for this change.
• I adjusted the values.yaml file and the documentation for all values.

[codecov-commenter]

Codecov Report

Merging #341 (bc673c4) into rework-kobs-architecture (8a0abd4) will increase coverage by 2.90%.
The diff coverage is 72.74%.

@@                     Coverage Diff                      @@
##           rework-kobs-architecture     #341      +/-   ##
============================================================
+ Coverage                     46.43%   49.33%   +2.90%     
============================================================
  Files                            98      115      +17     
  Lines                          6803     7647     +844     
============================================================
+ Hits                           3159     3773     +614     
- Misses                         3577     3798     +221     
- Partials                         67       76       +9     

Impacted Files	Coverage Δ
plugins/plugin-azure/pkg/instance/instance.go	11.11% <11.11%> (ø)
.../instance/containerinstances/containerinstances.go	18.60% <18.60%> (ø)
.../instance/kubernetesservices/kubernetesservices.go	20.00% <20.00%> (ø)
...virtualmachinescalesets/virtualmachinescalesets.go	20.00% <20.00%> (ø)
...ugins/plugin-azure/pkg/instance/monitor/monitor.go	25.00% <25.00%> (ø)
...zure/pkg/instance/resourcegroups/resourcegroups.go	25.00% <25.00%> (ø)
plugins/plugin-azure/cmd/azure.go	35.41% <35.41%> (ø)
...zure/pkg/instance/costmanagement/costmanagement.go	42.10% <42.10%> (ø)
plugins/plugin-azure/cmd/containerinstances.go	100.00% <100.00%> (ø)
plugins/plugin-azure/cmd/costmanagement.go	100.00% <100.00%> (ø)
... and 7 more

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