Initial import of the CBDDC codebase with docs and tests. Add a .NET-focused gitignore to keep generated artifacts out of source control.

src/ZB.MOM.WW.CBDDC.Network/IOplogPruneCutoffCalculator.cs

@@ -0,0 +1,21 @@
+using System.Threading;
+using System.Threading.Tasks;
+using ZB.MOM.WW.CBDDC.Core.Network;
+
+namespace ZB.MOM.WW.CBDDC.Network;
+
+/// <summary>
+/// Calculates the effective oplog prune cutoff for maintenance.
+/// </summary>
+public interface IOplogPruneCutoffCalculator
+{
+    /// <summary>
+    /// Calculates the effective prune cutoff for the provided node configuration.
+    /// </summary>
+    /// <param name="configuration">The local node configuration.</param>
+    /// <param name="cancellationToken">The cancellation token.</param>
+    /// <returns>A prune cutoff decision describing whether prune is allowed and at which cutoff.</returns>
+    Task<OplogPruneCutoffDecision> CalculateEffectiveCutoffAsync(
+        PeerNodeConfiguration configuration,
+        CancellationToken cancellationToken = default);
+}