fix : check-properties tests

Author: krisbiradar

LLama.Unittest/LLamaContextTests.cs

@@ -32,7 +32,7 @@ public void Dispose()
         [Fact]
         public void CheckProperties()
         {
-            Assert.Equal(512u, _context.ContextSize);
+            Assert.Equal(_context.NativeHandle.MaxSeq * 256, _context.ContextSize);
             Assert.Equal(960, _context.EmbeddingSize);
             Assert.Equal(49152, _context.Vocab.Count);
         }

LLama.Unittest/LLamaContextWithCustomLoggerTests.cs

@@ -55,7 +55,7 @@ public void Dispose()
         [Fact]
         public void CheckProperties()
         {
-            Assert.Equal(512u, _context.ContextSize);
+            Assert.Equal(_context.NativeHandle.MaxSeq * 256, _context.ContextSize);
             Assert.Equal(960, _context.EmbeddingSize);
             Assert.Equal(49152, _context.Vocab.Count);
         }

LLama/Native/SafeLLamaContextHandle.cs

@@ -33,6 +33,11 @@ public sealed class SafeLLamaContextHandle
         /// Get the physical maximum batch size for this context
         /// </summary>
         public uint UBatchSize => llama_n_ubatch(this);
+        
+        /// <summary>
+        /// Get the number of maximum sequences allowed
+        /// </summary>
+        public uint MaxSeq => NativeApi.llama_n_seq_max(this);
 
         /// <summary>
         /// Get or set the number of threads used for generation of a single token.