Added clickhouse state store

[middt]

Description

This PR adds a new state store component for ClickHouse, a column-oriented database management system. The ClickHouse state store component provides the following features:

• Basic CRUD operations for state management
• Support for TTL (Time-To-Live)
• ETag support for optimistic concurrency
• Bulk operations support
• Username/password authentication
• Uses ReplacingMergeTree engine for efficient updates

Key implementation details:

• Uses the official ClickHouse Go driver
• Implements the full state.Store interface
• Handles connection management and cleanup
• Includes comprehensive integration tests
• Follows Dapr's component development guidelines

Implementation Details

The component includes:

1. State store implementation (clickhouse.go)

   • Full CRUD operations
   • Bulk operations
   • TTL support
   • ETag support
   • Authentication support

2. Tests (clickhouse_test.go)

   • Integration tests for CRUD operations
   • Metadata validation tests
   • Authentication tests
   • Cleanup handling

3. Configuration options:

   apiVersion: dapr.io/v1alpha1
   kind: Component
   metadata:
     name: statestore
     namespace: default
   spec:
     type: state.clickhouse
     version: v1
     metadata:
     - name: clickhouseURL
       value: "tcp://localhost:9000"
     - name: databaseName
       value: "dapr_state"
     - name: tableName
       value: "state_store"
     - name: username
       value: "default"
     - name: password
       value: ""

Checklist

• Code compiles correctly
• Created/updated tests
• Extended the documentation / Created issue in the https://github.com/dapr/docs/ repo: dapr/docs#[issue number]

Testing Done

1. Unit tests for metadata validation
2. Integration tests for:
   • Basic CRUD operations
   • TTL functionality
   • ETag support
   • Bulk operations
   • Authentication
   • Error handling

Tests were run against ClickHouse v23.8 using the official Go driver.

Additional Notes

• The component uses ReplacingMergeTree engine for better update performance
• Includes proper cleanup in tests to avoid test pollution
• Follows ClickHouse best practices for table design
• Implements proper connection management and cleanup

[middt]

Hello @yaron2
Is there a problem with PR?
We plan to use this in our new application; can you confirm if there is no problem?

[yaron2]

This is a good PR and a great addition to Dapr! I see no issues merging it, however we are currently in the end game time of the 1.15 release and have P0 priorities for this release - so this component will make it into 1.16

[middt]

Thank you for the positive feedback and for considering this PR as a valuable addition to Dapr @yaron2. I understand the current focus on P0 priorities for the 1.15 release. I'm glad to hear that this component will be included in the 1.16 release. If there are any further adjustments or preparations needed to ensure smooth integration in the next release cycle, please let me know.

[github-actions]

This pull request has been automatically marked as stale because it has not had activity in the last 30 days. It will be closed in 7 days if no further activity occurs. Please feel free to give a status update now, ping for review, or re-open when it's ready. Thank you for your contributions!

[github-actions]

This pull request has been automatically closed because it has not had activity in the last 37 days. Please feel free to give a status update now, ping for review, or re-open when it's ready. Thank you for your contributions!

[middt]

ping pong

[middt]

ping pong