feat: initial solution with HrynCo.DAL.Abstract and HrynCo.DAL.EF

- HrynCo.DAL.Abstract: IEntity<TId>, Entity base classes, ITransaction, IUnitOfWork
- HrynCo.DAL.EF: EfRepository<TDbContext,TEntity>, EfUnitOfWork<TDbContext>, EfTransactionAdapter
- Directory.Packages.props with centralized EF Core 9.0.5 versions
- TeamCity pipeline YAMLs for general-checks and publish

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

HrynCo.DAL.EF/Core/EfTransactionAdapter.cs

@@ -0,0 +1,29 @@
+using HrynCo.DAL.Abstract;
+using Microsoft.EntityFrameworkCore.Storage;
+
+namespace HrynCo.DAL.EF.Core;
+
+internal sealed class EfTransactionAdapter : ITransaction
+{
+    private readonly IDbContextTransaction _transaction;
+
+    internal EfTransactionAdapter(IDbContextTransaction transaction)
+    {
+        _transaction = transaction;
+    }
+
+    public Task CommitAsync(CancellationToken cancellationToken = default)
+    {
+        return _transaction.CommitAsync(cancellationToken);
+    }
+
+    public Task RollbackAsync(CancellationToken cancellationToken = default)
+    {
+        return _transaction.RollbackAsync(cancellationToken);
+    }
+
+    public ValueTask DisposeAsync()
+    {
+        return _transaction.DisposeAsync();
+    }
+}