feat(abstractions): add custom kubernetes entity helper

Author: Christoph Bühler

src/KubeOps.Abstractions/Entities/CustomKubernetesEntity.cs

@@ -0,0 +1,16 @@
+using k8s;
+using k8s.Models;
+
+namespace KubeOps.Abstractions.Entities;
+
+/// <summary>
+/// Base class for custom Kubernetes entities. The interface <see cref="IKubernetesObject{TMetadata}"/>
+/// can be used on its own, but this class provides convenience initializers.
+/// </summary>
+public abstract class CustomKubernetesEntity : KubernetesObject, IKubernetesObject<V1ObjectMeta>
+{
+    /// <summary>
+    /// The metadata of the kubernetes object.
+    /// </summary>
+    public V1ObjectMeta Metadata { get; set; } = new();
+}

src/KubeOps.Abstractions/Entities/CustomKubernetesEntity{TSpec,TStatus}.cs

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+using k8s;
+
+namespace KubeOps.Abstractions.Entities;
+
+/// <summary>
+/// Defines a custom Kubernetes entity.
+/// This entity contains a spec (like <see cref="CustomKubernetesEntity{TSpec}"/>)
+/// and a status (<see cref="Status"/>) which can be updated to reflect the state
+/// of the entity.
+/// </summary>
+/// <typeparam name="TSpec">The type of the specified data.</typeparam>
+/// <typeparam name="TStatus">The type of the status data.</typeparam>
+public abstract class CustomKubernetesEntity<TSpec, TStatus> : CustomKubernetesEntity<TSpec>, IStatus<TStatus>
+    where TSpec : new()
+    where TStatus : new()
+{
+    /// <summary>
+    /// Status object for the entity.
+    /// </summary>
+    public TStatus Status { get; set; } = new();
+}

src/KubeOps.Abstractions/Entities/CustomKubernetesEntity{TSpec}.cs

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+using k8s;
+
+namespace KubeOps.Abstractions.Entities;
+
+/// <summary>
+/// Defines a custom kubernetes entity which can be used in finalizers and controllers.
+/// This entity contains a <see cref="Spec"/>, which means in contains specified data.
+/// </summary>
+/// <typeparam name="TSpec">The type of the specified data.</typeparam>
+public abstract class CustomKubernetesEntity<TSpec> : CustomKubernetesEntity, ISpec<TSpec>
+    where TSpec : new()
+{
+    /// <summary>
+    /// Specification of the kubernetes object.
+    /// </summary>
+    public TSpec Spec { get; set; } = new();
+}