Improve testability, packaging, and docs

src/LibNftables/INftContextHandle.cs

@@ -0,0 +1,26 @@
+namespace LibNftables;
+
+internal interface INftContextHandle : System.IDisposable
+{
+    bool DryRun { get; set; }
+
+    NftOptimizeFlags OptimizeFlags { get; set; }
+
+    NftInputFlags InputFlags { get; set; }
+
+    NftOutputFlags OutputFlags { get; set; }
+
+    NftDebugLevel DebugFlags { get; set; }
+
+    void BufferOutput();
+
+    void BufferError();
+
+    string? GetOutputBuffer();
+
+    string? GetErrorBuffer();
+
+    void RunCommand(string commandText);
+
+    void RunCommandFromFile(string path);
+}