GO: Lazy connect implementation

[affonsov]

Overview

This PR implements lazy connection functionality for the Valkey GLIDE Go client, allowing clients to defer connection establishment until the first operation is executed.

Key Features

• Deferred Connection: Clients with lazy connect enabled only establish connections when the first operation is executed
• Backward Compatibility: Lazy connect is disabled by default, maintaining existing behavior
• Full Support: Available for both standalone and cluster client configurations
• Testing: Includes unit tests and integration tests validating the lazy connection behavior

Testing

• New unit tests verify configuration and protobuf conversion
• Integration tests confirm lazy connection behavior in both standalone and cluster modes
• Connection count monitoring ensures connections are established only when needed

Changes Made

Configuration Updates (go/config/config.go)

• Added lazyConnect field to baseClientConfiguration struct
• Implemented WithLazyConnect() method for both ClientConfiguration and ClusterClientConfiguration

Unit Test (go/config/config_test.go)

• Added TestConfig_LazyConnect() test function covering:
  • Lazy connect enabled for both standalone and cluster configurations
  • Default behavior verification (lazy connect disabled by default)

Integration Testing Infrastructure

• New cluster management utilities

  • Port from (python/tests/utils/cluster.py) to (go/integTest/cluster.go`):
  • ValkeyCluster struct for managing test cluster instances
  • Support for both TLS and non-TLS configurations
  • Flexible cluster creation with configurable shard/replica counts
  • Integration with existing cluster manager Python scripts
  • Proper cleanup and resource management

• Connection testing (go/integTest/connection_test.go):

  • TestLazyConnectionEstablishesOnFirstCommand() - test validating lazy connection behavior
  • Helper functions for client count monitoring and connection tracking
  • Support for both standalone and cluster mode testing
  • Verification that connections are only established after the first command

• Test suite enhancements (go/integTest/glide_test_suite_test.go):

  • createClient() helper function for flexible client creation
  • Support for lazy connect configuration in test clients
  • Unified client creation interface for both standalone and cluster modes

Issue link

This Pull Request is linked to issue (URL): #4350

Checklist

Before submitting the PR make sure the following are checked:

• This Pull Request is related to one issue.
• Commit message has a detailed description of what changed and why.
• Tests are added or updated.
• CHANGELOG.md and documentation files are updated.
• Destination branch is correct - main or release
• Create merge commit if merging release branch into main, squash otherwise.

[Yury-Fridlyand]

Please add changelog

[jamesx-improving]

LGTM. All comments nit.