implemented rabbitmq message broker support (publisher)

dotnet/AipsCore/Infrastructure/MessageBroking/RabbitMQ/RabbitMqConnection.cs

@@ -0,0 +1,43 @@
+using AipsCore.Infrastructure.DI.Configuration;
+using Microsoft.Extensions.Configuration;
+using RabbitMQ.Client;
+
+namespace AipsCore.Infrastructure.MessageBroking.RabbitMQ;
+
+public class RabbitMqConnection : IRabbitMqConnection
+{
+    private readonly IConfiguration _configuration;
+    private IConnection? _connection;
+
+    public RabbitMqConnection(IConfiguration configuration)
+    {
+        _configuration = configuration;
+    }
+    
+    public async Task<IChannel> CreateChannelAsync(CancellationToken cancellationToken = default)
+    {
+        if (_connection is null)
+        {
+            throw new InvalidOperationException($"RabbitMQ connection not created for {_configuration.GetEnvRabbitMqAmqpUri()}");
+        }
+
+        return await _connection.CreateChannelAsync(null, cancellationToken);
+    }
+
+    public async Task CreateConnectionAsync()
+    {
+        var factory = CreateConnectionFactory();
+
+        _connection = await factory.CreateConnectionAsync();
+    }
+
+    private IConnectionFactory CreateConnectionFactory()
+    {
+        var factory = new ConnectionFactory
+        {
+            Uri = new Uri(_configuration.GetEnvRabbitMqAmqpUri())
+        };
+
+        return factory;
+    }
+}