Allow kubegres manager to manage SQL connections to the primary instance

[sergicastro]

I need to finish testing of the TLS PR #51 before making this connection management compatible with TLS-secured connections.

The func (r *ServicesCountSpecEnforcer) canConnectToPrimaryDb() bool method is the current one checking all of this works.
It will need to be removed once the target PR starts using these changes.

[Copilot]

Pull Request Overview

This PR adds SQL connection management functionality to the kubegres manager, allowing it to establish and manage connections to primary PostgreSQL instances. The implementation includes a new connection store system, DSN management for dynamic connection configuration, and reconciliation logic to handle Kubegres resources and their associated secrets.

• Introduces connection management infrastructure with thread-safe stores and dynamic DSN handling
• Adds new reconcilers for Kubegres resources and secrets to manage database connections
• Implements TLS configuration support in the API for secure database connections

Reviewed Changes

Copilot reviewed 16 out of 16 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
internal/sql/store.go	Implements thread-safe connection store for managing database connections by ConnectionID
internal/sql/connection.go	Provides connection abstractions with DSN management and dynamic reconnection capabilities
controllers/connection/reconciler.go	Implements reconciliation logic for database connections based on Kubegres and secret changes
controllers/connection/sync_map.go	Generic thread-safe map implementation for connection management
controllers/kubegres_controller.go	Updates main controller to include connection store dependency
api/v1/kubegres_types.go	Adds TLS configuration struct to Kubegres API
test/util/DbConnectionTestUtil.go	Enhances test utilities to export connection details via environment variables
test/util/MockLogger.go	Improves mock logger name handling and formatting