Use C# 10 global using directives.

Author: bgrainger

src/MySqlConnector/Authentication/AuthenticationPlugins.cs

@@ -1,4 +1,3 @@
-using System;
 using System.Collections.Generic;
 using System.Diagnostics.CodeAnalysis;
 

src/MySqlConnector/Authentication/IAuthenticationPlugin.cs

@@ -1,5 +1,3 @@
-using System;
-
 namespace MySqlConnector.Authentication;
 
 /// <summary>

src/MySqlConnector/Core/CachedParameter.cs

@@ -1,6 +1,3 @@
-using System;
-using System.Data;
-
 namespace MySqlConnector.Core;
 
 internal sealed class CachedParameter

src/MySqlConnector/Core/CommandExecutor.cs

@@ -1,7 +1,4 @@
-using System;
 using System.Collections.Generic;
-using System.Data;
-using System.Data.Common;
 using System.IO;
 using System.Net.Sockets;
 using System.Threading;

src/MySqlConnector/Core/ConnectionSettings.cs

@@ -1,4 +1,3 @@
-using System;
 using System.Collections.Generic;
 using System.IO;
 using System.Net.Security;

src/MySqlConnector/Core/EnlistedTransactionBase.cs

@@ -1,4 +1,3 @@
-using System;
 using System.Transactions;
 
 namespace MySqlConnector.Core;

src/MySqlConnector/Core/ILoadBalancer.cs

@@ -1,4 +1,3 @@
-using System;
 using System.Collections.Generic;
 
 namespace MySqlConnector.Core;

src/MySqlConnector/Core/NormalizedSchema.cs

@@ -1,4 +1,3 @@
-using System;
 using System.Text.RegularExpressions;
 
 namespace MySqlConnector.Core;

src/MySqlConnector/Core/ParsedStatements.cs

@@ -1,4 +1,3 @@
-using System;
 using System.Collections.Generic;
 using MySqlConnector.Protocol;
 

src/MySqlConnector/Core/ResultSet.cs

@@ -1,7 +1,5 @@
-using System;
 using System.Buffers;
 using System.Collections.Generic;
-using System.Data;
 using System.Globalization;
 using System.IO;
 using System.Runtime.ExceptionServices;