Running through DocumentStore and all the various ITenancy implementa…

…tions to try to guarantee the the NpgsqlDataSource's are all disposed. Closes GH-3175

src/Marten/DocumentStore.cs

@@ -108,7 +108,7 @@ public virtual void Dispose()
     public ValueTask DisposeAsync()
     {
         return DisposableExtensions
-            .MaybeDisposeAllAsync<object>([dataSourceFactory, Options.Events]);
+            .MaybeDisposeAllAsync<object>([dataSourceFactory, Options.Events, Tenancy]);
     }
 
     public AdvancedOperations Advanced { get; }

src/Marten/Storage/MartenDatabase.cs

@@ -117,6 +117,7 @@ private void resetSequences()
 
     public void Dispose()
     {
+        DataSource?.Dispose();
         ((IDisposable)Tracker)?.Dispose();
     }
 }

src/Marten/Storage/MasterTableTenancy.cs

@@ -130,6 +130,11 @@ public MasterTableTenancy(StoreOptions options, MasterTableTenancyOptions tenanc
     public void Dispose()
     {
         foreach (var entry in _databases.Enumerate()) entry.Value.Dispose();
+
+        if (_dataSource.IsValueCreated)
+        {
+            _dataSource.Value.Dispose();
+        }
     }
 
     public async ValueTask<IReadOnlyList<IDatabase>> BuildDatabases()

src/Marten/Storage/SingleServerMultiTenancy.cs

@@ -85,6 +85,8 @@ public void Dispose()
         {
             entry.Value.Database.Dispose();
         }
+
+        _default.Database.Dispose();
     }
 
     public ISingleServerMultiTenancy WithTenants(params string[] tenantIds)