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 as an experiment

Author: zsogitbe

LLama.Unittest/Constants.cs

@@ -20,15 +20,16 @@ public static int CIGpuLayerCount
         {
             get
             {
-                if (RuntimeInformation.IsOSPlatform(OSPlatform.OSX))
-                {
-                    #if DEBUG
-                      return 20;
-                    #else
-                      return 0;                      
-                    #endif
-                }
-                else return 20;
+                return 0;
+                //if (RuntimeInformation.IsOSPlatform(OSPlatform.OSX))
+                //{
+                //    #if DEBUG
+                //      return 20;
+                //    #else
+                //      return 0;                      
+                //    #endif
+                //}
+                //else return 20;
             }
         }
     }