Implement pkg/runtime helpers

[hiddeco]

As part of the refactor work to set out some standards for the controllers that are part of the Flux family, the pkg/runtime helpers and interfaces should be implemented to work with the conditions, metrics and events recorded for HelmRelease resources.

In short, (at least) the following should be implemented:

• HelmRelease should implement the interfaces from conditions, and use this package to work with conditions.
• HelmReleaseReconciler should implement the helpers from controller, and use these to record Events and Metrics.
• HelmReleaseReconciler should exit early without recording any status when .spec.suspend is defined.
• The patch package should be implemented to (safely) patch resources without running into conflicts.
• The kstatus Reconciling and Stalled conditions should be properly implemented to provide better signals.

More examples can be found at:

• Rewrite HelmRepositoryReconciler to new standards source-controller#413
• Port to new pkg/runtime helpers image-automation-controller#218