…ent`

This commit includes a significant change where the `System.Data.SqlClient` package has been replaced with `Microsoft.Data.SqlClient` across multiple files. This is a breaking change and is highlighted in the `Changelog.md` file. The `Microsoft.Data.SqlClient` package is the latest and recommended data provider for SQL Server.

The connection string for `NEventStore.MsSql` in the `README.md` file has been updated. The `.editorconfig` file now includes new rules for code formatting and style. The `NEventStore.Persistence.Sql.nuspec` file and several project files have been updated to replace the `System.Data.SqlClient` dependency with `Microsoft.Data.SqlClient`.

Several test files have been updated to use `Microsoft.Data.SqlClient` and their code formatting has been updated. The `using System.Data.SqlClient;` and `using Microsoft.Data.SqlClient;` statements have been removed from the `MsSqlDialect.cs` file, and the `using System;` statement has been added.

The `#if NET462` preprocessor directive and its associated code have been removed. The `SqlException` class from the `System.Data.SqlClient` namespace has been replaced with the `SqlException` class from the `Microsoft.Data.SqlClient` namespace in the `IsDuplicate` method.

Lastly, the `MsSqlDialect` and `MsSql2005Dialect` classes have been restructured but their functionality remains the same.