feat: Add NetEvolve.Pulse.AzureQueueStorage transport package

[Copilot]

Adds a new NetEvolve.Pulse.AzureQueueStorage package providing Azure Queue Storage as a Pulse outbox transport — a cheaper alternative to Azure Service Bus available in every Azure Storage account.

New package: NetEvolve.Pulse.AzureQueueStorage

• Targets: net8.0;net9.0;net10.0
• Key dependencies: Azure.Storage.Queues, Azure.Identity

Transport behavior

• QueueClient lazily initialized via SemaphoreSlim double-checked locking; uses connection string or DefaultAzureCredential based on options
• Messages JSON-serialized → UTF-8 encoded → Base64-encoded before SendMessageAsync
• Raw payload > 48 KB (64 KB Base64 limit) throws InvalidOperationException
• SendBatchAsync iterates sequentially
• Optional auto-queue creation via CreateQueueIfNotExists = true (default)

Registration

// Connection string
services.AddPulse(config => config.UseAzureQueueStorageTransport(
    connectionString: configuration["Storage:ConnectionString"]!
));

// Managed identity
services.AddPulse(config => config.UseAzureQueueStorageTransport(
    queueServiceUri: new Uri("https://myaccount.queue.core.windows.net")
));

Options

Property	Default	Description
ConnectionString	null	Azure Storage connection string
QueueServiceUri	null	Service URI for DefaultAzureCredential auth
QueueName	"pulse-outbox"	Target queue name
MessageVisibilityTimeout	null	Per-message visibility timeout
CreateQueueIfNotExists	true	Auto-create queue on first use

Validation (either ConnectionString or QueueServiceUri required, QueueName non-empty) is registered with ValidateOnStart(). AzureQueueStorageTransportOptionsConfiguration is provided for binding from Pulse:Transports:AzureQueueStorage config section when needed.