- Bump `gitversion.tool` to version `6.1.0`.
- Add entry for `NEventStore` version `10.0.0` in `Changelog.md`.
- Modify `build.ps1` to utilize the updated `gitversion` tool.
- Change subproject commit hash in the `NEventStore` directory.
- Add new binary file `icon.png`.
- Update `.editorconfig` with new formatting rules and diagnostics.
- Change `NEventStore` dependency range in `NEventStore.Domain.nuspec`.
- Set language version to `13.0` and enable nullable types in `Directory.Build.props`.
- Update target frameworks and package references in `NEventStore.Domain.Core.Tests.csproj`.
- Enhance `NEventStore.Domain.Core.csproj` with additional package generation properties.

- Updated Changelog.md to reflect breaking changes in IRepository.
- Adjusted .editorconfig for diagnostic severity settings.
- Added .editorconfig to solution items in NEventStore.Domain.Core.sln.
- Modified AggregateFactory.Build method to accept optional IMemento? parameter.
- Refactored AggregateBase to use nullable types for improved safety.
- Updated IAggregate, IConstructAggregates, and IConstructSagas interfaces for nullable types.
- Improved XML comments in ConflictingCommandException and PersistenceException classes.
- Refactored EventStoreRepository and SagaEventStoreRepository for better handling of nulls and events.
- Enhanced RepositoryExtensions with new methods for aggregate retrieval and saving.
- Introduced SagaRepositoryExtensions for additional saga repository methods.

This commit introduces asynchronous methods `SaveAsync` and `GetByIdAsync` in the `IRepository` and `ISagaRepository` interfaces, along with their implementations in the respective repository classes. Nullable reference types are now used for better null handling.

Test classes have been updated to validate the new asynchronous operations. The `SagaFactory` class has been modified to throw an exception if a constructor is not found, enhancing error handling.

Additionally, the `EventStoreRepository` and `SagaEventStoreRepository` classes have been updated to improve performance and responsiveness during I/O operations. These changes enhance the functionality and robustness of the persistence layer, allowing for better scalability and performance in handling aggregates and sagas.

- Updated subproject commit for NEventStore.
- Changed NEventStore dependency version range to stable releases in `NEventStore.Domain.nuspec`.
- Added `using System` directive and simplified `handlers` dictionary type in `RegistrationEventRouter.cs`.
- Added `PackageReference` for `Microsoft.SourceLink.GitHub` in `NEventStore.Domain.Core.csproj` to improve GitHub integration.

Modified `build.ps1` to enable continuous integration builds by adding `/p:ContinuousIntegrationBuild=true` to the `dotnet build` command. Updated the `$nugetversion` variable to pull from `$json.SemVer` for better version management. Also, updated the commit hash in the `NEventStore` subproject to reflect the latest changes.

Updated the NEventStore subproject from commit
`82c2da7a983c5d2b1e89e9e6ed396febaadfd24b` to
`aaef5b5a8f07d5774a6fd7291cb09c1c676a8f83`.