Add Aspire orchestration

Therefore remove previous OpenTelemetry configuration and use the one
provided in service defaults

src/Vegasco.Server.AppHost.Shared/Constants.cs

@@ -0,0 +1,16 @@
+namespace Vegasco.Server.AppHost.Shared;
+
+public static class Constants
+{
+	public static class Projects
+	{
+		public const string WebApiName = "webapi";
+	}
+
+	public static class Database
+	{
+		public const string ServiceName = "postgres";
+
+		public const string Name = "vegasco";
+	}
+}

src/Vegasco.Server.AppHost.Shared/Vegasco.Server.AppHost.Shared.csproj

@@ -0,0 +1,9 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net9.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>