feat: add DI form factory

Examples/EFCoreBot/Database/BotDbContext.cs

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+using Microsoft.EntityFrameworkCore;
+
+namespace EFCoreBot.Database;
+
+public class BotDbContext : DbContext
+{
+    public BotDbContext(DbContextOptions options) : base(options)
+    {
+    }
+
+    public DbSet<User> Users { get; set; }
+}

Examples/EFCoreBot/Database/User.cs

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+namespace EFCoreBot.Database;
+
+public class User
+{
+    public long Id { get; set; }
+    public string LastMessage { get; set; }
+}

Examples/EFCoreBot/EFCoreBot.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <OutputType>Exe</OutputType>
+        <TargetFramework>net6.0</TargetFramework>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>disable</Nullable>
+    </PropertyGroup>
+
+    <ItemGroup>
+      <PackageReference Include="Microsoft.EntityFrameworkCore" Version="6.0.8" />
+      <PackageReference Include="Microsoft.EntityFrameworkCore.InMemory" Version="6.0.8" />
+    </ItemGroup>
+
+    <ItemGroup>
+      <ProjectReference Include="..\..\TelegramBotBase\TelegramBotBase.csproj" />
+    </ItemGroup>
+
+</Project>

Examples/EFCoreBot/Program.cs

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+using EFCoreBot;
+using EFCoreBot.Database;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.DependencyInjection;
+using TelegramBotBase.Builder;
+
+var serviceCollection = new ServiceCollection()
+    .AddDbContext<BotDbContext>(x => x.UseInMemoryDatabase("TelegramBotBase"));
+
+var serviceProvider = serviceCollection.BuildServiceProvider();
+
+var bot = BotBaseBuilder.Create()
+    .WithAPIKey(Environment.GetEnvironmentVariable("API_KEY") ?? throw new Exception("API_KEY is not set"))
+    .DefaultMessageLoop()
+    .WithServiceProvider<StartForm>(serviceProvider)
+    .NoProxy()
+    .NoCommands()
+    .NoSerialization()
+    .DefaultLanguage()
+    .Build();
+
+bot.Start();
+await Task.Delay(-1);

Examples/EFCoreBot/StartForm.cs

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+using EFCoreBot.Database;
+using TelegramBotBase.Base;
+using TelegramBotBase.Form;
+
+namespace EFCoreBot;
+
+public class StartForm : FormBase
+{
+    private readonly BotDbContext _dbContext;
+
+    public StartForm(BotDbContext dbContext)
+    {
+        _dbContext = dbContext;
+    }
+
+    public override async Task Load(MessageResult message)
+    {
+        var user = await _dbContext.Users.FindAsync(Device.DeviceId);
+        if (user is null)
+        {
+            user = new User
+            {
+                Id = Device.DeviceId,
+                LastMessage = "<unknown>"
+            };
+
+            _dbContext.Users.Add(user);
+            await _dbContext.SaveChangesAsync();
+        }
+
+        await Device.Send($"Your last message's text was: `{user.LastMessage}`");
+
+        user.LastMessage = string.IsNullOrWhiteSpace(message.MessageText) ? "<unknown>" : message.MessageText;
+        await _dbContext.SaveChangesAsync();
+    }
+}