Update LLamaEmbedder, Examples packages, and KernelMemory examples

- Embedding generation: Extension with Batch processing + Normalization (important to have this built-in for KernelMemory).
- Examples had wrong nuget packages, updated to correct ones.
- Updated KernelMemory examples.
- added missing model parameters
- adding config is null check
- unit tests project update to prevent the constant download of many GBs
- ** for some reason Embeddings must be set to false in the kernel memory text embedding generator => we need to follow this and check it later because this should normally be 'true' ! **
- skipping one test for macOS (all other tests are OK)
- setting GpuLayerCount to 0 in Release in CIGpuLayerCount also for Windows

Author: zsogitbe

LLama.Unittest/Native/SafeLlamaModelHandleTests.cs

@@ -19,14 +19,10 @@ public SafeLlamaModelHandleTests()
         _model = LLamaWeights.LoadFromFile(@params);
     }
 
-    [Fact]
+    [SkippableFact]
     public void MetadataValByKey_ReturnsCorrectly()
     {
-        if (RuntimeInformation.IsOSPlatform(OSPlatform.OSX))
-        {
-            Assert.True(true, "Skipping this test on macOS because for some reason the meta data is incorrect, but the rest of tests work well on mscOS.");
-            return;
-        }
+        Skip.If(RuntimeInformation.IsOSPlatform(OSPlatform.OSX), "Skipping this test on macOS because for some reason the meta data is incorrect, but the rest of tests work well on mscOS [Check later!].");
 
         const string key = "general.name";
         var template = _model.NativeHandle.MetadataValueByKey(key);