Consolidate multiple commits into one: Add PVC manager functionality and Fix xfs_qouta clear projid

[laik]

Title: Introduce PVC Manager for High-Performance LocalPV Provisioning

Description:

This PR introduces a new architecture for the OpenEBS Dynamic LocalPV Provisioner, addressing performance bottlenecks identified during stress testing (see openebs/openebs#4050). The core change replaces the traditional helper pod mechanism with a DaemonSet-based PVC Manager service that performs volume operations via direct HTTP API calls.

Key Changes:

1. New PVC Manager Component:

   • A new pvc-manager binary is added (cmd/pvc-manager/) which runs as a DaemonSet on each node.
   • It exposes HTTP endpoints for creating directories, applying quotas, and deleting volumes.
   • This eliminates the overhead of creating and terminating ephemeral helper pods for each operation.

2. Provisioner Integration:

   • The main provisioner logic (cmd/provisioner-localpv/) is updated to conditionally use the new PVC Manager.
   • A new client (cmd/provisioner-localpv/app/pvc_manager_client.go) handles communication with the PVC Manager service.
   • New helper functions (cmd/provisioner-localpv/app/helper_pvc_manager.go) orchestrate the HTTP calls.
   • Environment variables OPENEBS_IO_ENABLE_PVC_MANAGER (default true) and OPENEBS_IO_PVC_MANAGER_PORT (default 8080) control this behavior.

3. Deployment Updates:

   • New Kubernetes manifests are added for deploying the PVC Manager DaemonSet and its associated RBAC (deploy/kubectl/pvc-manager-*, deploy/helm/charts/templates/pvc-manager-*).
   • Documentation is provided in design/pvc-manager-architecture.md and deploy/helm/charts/PVC-MANAGER-INTEGRATION.md.

Benefits:

• Significantly Improved Performance: As highlighted in issue #4050, this change drastically reduces PVC binding times, especially under load, by removing the pod creation bottleneck.
• Reduced API Server Load: Fewer transient pod objects are created and managed by the Kubernetes API server.
• Enhanced Reliability: A long-running service is generally more predictable than ephemeral pods.
• Better Resource Utilization: The DaemonSet model provides a more consistent resource footprint.

This new architecture provides a substantial performance improvement for LocalPV provisioning, directly addressing the concerns raised in issue #4050. Backward compatibility with the helper pod mode is maintained via the OPENEBS_IO_ENABLE_PVC_MANAGER environment variable.

[niladrih]

Hi @laik. I'm yet to review your PR. Just letting you know that we require DCO signatures on all commits. You might have already noticed the failing CI job.

[laik]

Hi @laik. I'm yet to review your PR. Just letting you know that we require DCO signatures on all commits. You might have already noticed the failing CI job.

Yes, I saw it, it was added