.Net: Added metadata specifying connection stems from MSK code (#5269)

### Motivation and Context
### Description

MongoDB drivers are used in various flavors and languages. Making sure
we exercise our due diligence in identifying the "origin" of the library
calls makes it best to understand how our Atlas servers get accessed.
Similar to [Python
PR](#3419).

### Contribution Checklist

<!-- Before submitting this PR, please make sure: -->

- [x] The code builds clean without any errors or warnings
- [x] The PR follows the [SK Contribution
Guidelines](https://github.com/microsoft/semantic-kernel/blob/main/CONTRIBUTING.md)
and the [pre-submission formatting
script](https://github.com/microsoft/semantic-kernel/blob/main/CONTRIBUTING.md#development-scripts)
raises no violations
- [x] All unit tests pass, and I have added new tests where possible
- [x] I didn't break anyone 😄

Co-authored-by: Mark Wallace <127216156+markwallace-microsoft@users.noreply.github.com>
Co-authored-by: Dmytro Struk <13853051+dmytrostruk@users.noreply.github.com>

dotnet/src/Connectors/Connectors.Memory.MongoDB/MongoDBMemoryStore.cs

@@ -7,6 +7,7 @@
 using System.Threading.Tasks;
 using Microsoft.SemanticKernel.Memory;
 using MongoDB.Driver;
+using MongoDB.Driver.Core.Configuration;
 
 namespace Microsoft.SemanticKernel.Connectors.MongoDB;
 
@@ -22,7 +23,7 @@ public class MongoDBMemoryStore : IMemoryStore, IDisposable
     /// <param name="databaseName">Database name.</param>
     /// <param name="indexName">Name of the search index. If no value is provided default index will be used.</param>
     public MongoDBMemoryStore(string connectionString, string databaseName, string? indexName = default) :
-        this(new MongoClient(connectionString), databaseName, indexName)
+        this(new MongoClient(GetMongoClientSettings(connectionString)), databaseName, indexName)
     {
     }
 
@@ -219,6 +220,14 @@ protected virtual void Dispose(bool disposing)
     private static FilterDefinition<MongoDBMemoryEntry> GetFilterByIds(IEnumerable<string> ids) =>
         Builders<MongoDBMemoryEntry>.Filter.In(m => m.Id, ids);
 
+    private static MongoClientSettings GetMongoClientSettings(string connectionString)
+    {
+        var settings = MongoClientSettings.FromConnectionString(connectionString);
+        var skVersion = typeof(IMemoryStore).Assembly.GetName().Version.ToString();
+        settings.LibraryInfo = new LibraryInfo("Microsoft Semantic Kernel", skVersion);
+        return settings;
+    }
+
     private Task<IAsyncCursor<MongoDBMemoryEntry>> VectorSearch(
         string collectionName,
         ReadOnlyMemory<float> embedding,

dotnet/src/IntegrationTests/Connectors/Memory/MongoDB/MongoDBMemoryStoreTestsFixture.cs

@@ -5,7 +5,9 @@
 using System.Threading.Tasks;
 using Microsoft.Extensions.Configuration;
 using Microsoft.SemanticKernel.Connectors.MongoDB;
+using Microsoft.SemanticKernel.Memory;
 using MongoDB.Driver;
+using MongoDB.Driver.Core.Configuration;
 using Xunit;
 
 namespace SemanticKernel.IntegrationTests.Connectors.MongoDB;
@@ -39,8 +41,10 @@ public MongoDBMemoryStoreTestsFixture()
         var vectorSearchCollectionNamespace = CollectionNamespace.FromFullName(vectorSearchCollection);
         this.VectorSearchCollectionName = vectorSearchCollectionNamespace.CollectionName;
 
+        var skVersion = typeof(IMemoryStore).Assembly?.GetName()?.Version?.ToString();
         var mongoClientSettings = MongoClientSettings.FromConnectionString(connectionString);
         mongoClientSettings.ApplicationName = GetRandomName();
+        mongoClientSettings.LibraryInfo = new LibraryInfo("Microsoft Semantic Kernel", skVersion);
 
         this.DatabaseTestName = "dotnetMSKIntegrationTests1";
         this.ListCollectionsDatabaseTestName = "dotnetMSKIntegrationTests2";