Enable deployment of dex-operator to MC

[anvddriesch]

Towards giantswarm/roadmap#1432

This includes various changes to the helm chart, makefile and formatting of the config secret to make the operator functional on MCs.

[anvddriesch]

renamed the target as it is overridden by the giant swarm defaults otherwise

[anvddriesch]

this is just the makefile that kubebuilder creates by default. Renamed so that it does not get overwritten by Align Files

[anvddriesch]

still using a branch of config for the operator default values

[anvddriesch]

the dex package includes the types we need to marshal the dex config

[anvddriesch]

The controller works when it's deployed. :)
logs from test installation:

1.6656579833182502e+09	INFO	controllers.App	Added secret config to dex app instance.	{"app": "giantswarm/dex-app"}
1.6656579833364573e+09	INFO	controllers.App	Created default dex config secret for dex app instance.	{"app": "giantswarm/dex-app"}

The following config was added to the dex configuration using the mock connector:

  giantswarm:
    connectors:
    - connectorConfig:
        password: test
        username: test
      connectorName: Example
      connectorType: mockCallback
      id: mock