Initial implementation of procfile

Reviewed-on: #1

Pushy.Domain/ILinkGenerator.cs

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+namespace Pushy.Domain;
+
+public interface ILinkGenerator : IGrainWithGuidKey
+{
+    [Alias("GenerateLink")]
+    public ValueTask<LinkResult> GenerateTextShare([Immutable] string text);
+}

Pushy.Domain/ITextItem.cs

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+using Orleans.Concurrency;
+
+namespace Pushy.Domain;
+
+public interface ITextItem : IGrainWithStringKey
+{
+    [Alias("SetText")]
+    public ValueTask<TextSetResult> SetText(string text);
+    
+    [ReadOnly]
+    [return: Immutable]
+    [Alias("GetText")]
+    ValueTask<string> GetText();
+}

Pushy.Domain/LinkResult.cs

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+namespace Pushy.Domain;
+
+[Immutable]
+[GenerateSerializer]
+[Alias("Pushy.Grains.LinkResult")]
+public record LinkResult(ITextItem? Item);

Pushy.Domain/Pushy.Domain.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <TargetFramework>net9.0</TargetFramework>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+    </PropertyGroup>
+
+    <ItemGroup>
+      <PackageReference Include="Microsoft.Orleans.Sdk" Version="9.0.1" />
+    </ItemGroup>
+
+</Project>

Pushy.Domain/TextItem.cs

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+namespace Pushy.Domain;
+
+public sealed class TextItem
+{
+    public string? Text { get; set; }
+}

Pushy.Domain/TextSetResult.cs

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+namespace Pushy.Domain;
+
+[GenerateSerializer]
+public enum TextSetResult
+{
+    Failure,
+    Success
+}