Add Hibernate example with H2 in-memory database to idea-examples

[zaleslaw]

This commit introduces a new example demonstrating the integration of Kotlin DataFrame with Hibernate ORM and H2 in-memory database. It includes setup for Hibernate, entity mappings, and analytical operations using DataFrame. Dependencies and configuration for Hibernate and H2 are updated accordingly.

Closes #1363

[Copilot]

Pull Request Overview

This PR adds a comprehensive Hibernate ORM example to the idea-examples project, demonstrating how to use Kotlin DataFrame with Hibernate and H2 in-memory database. The example mirrors the existing Exposed example to showcase different ORM approaches with DataFrame integration.

• Adds Hibernate ORM integration with H2 in-memory database support
• Implements entity mappings for Customers, Artists, and Albums tables
• Demonstrates both Hibernate Criteria API and DataFrame analytical approaches

Reviewed Changes

Copilot reviewed 5 out of 6 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
gradle/libs.versions.toml	Adds Hibernate and HikariCP dependency versions and library definitions
hibernate.cfg.xml	Configures Hibernate with H2 in-memory database and entity mappings
main.kt	Main example implementation showing data loading, analysis, and persistence
entities.kt	JPA entity classes and DataFrame schema definitions
build.gradle.kts	Adds Hibernate, H2, and HikariCP dependencies to the project