Summary

Extend AzdClient in pkg/azdext/azd_client.go to include a ProvisioningServiceClient so extensions can open the provisioning bidirectional stream. Add a lazy-initialized client field and accessor method following the same pattern as ServiceTarget() and FrameworkService().

Parent Epic

Part of #7465 — Provisioning Providers in the AZD Extension Framework

Context

AzdClient is the extension-side gRPC client wrapper that provides lazy-initialized accessors for each service. The ProvisioningManager needs client.Provisioning() to open the bidirectional stream.

Pattern to Follow

// Existing pattern in azd_client.go:
func (c *AzdClient) ServiceTarget() ServiceTargetServiceClient {
    return c.serviceTargetClient  // lazy initialized
}

Detailed Requirements

1. Add provisioningClient ProvisioningServiceClient field (or lazy equivalent)
2. Add Provisioning() ProvisioningServiceClient accessor method
3. Initialize the client lazily on first access using the shared gRPC connection
4. Follow the exact same pattern as other client accessors

Acceptance Criteria

• provisioningClient ProvisioningServiceClient field on AzdClient
• Provisioning() ProvisioningServiceClient accessor method
• Client created lazily on first access
• Uses the same gRPC connection as other service clients

Dependencies

• Codegen: Generate Go code from provisioning.proto #7467 — Generated Go code (provides ProvisioningServiceClient interface)

Files

• Modify: pkg/azdext/azd_client.go