feat: add support for entity schema

[elfacu0]

Summary

This pull request introduces updates to add support for EntitySchema within the project. These updates improve the flexibility and functionality of AdminJS integration, allowing for more comprehensive resource support.

Details

• Allow Resources to Use EntitySchema and BaseEntity
• Update Example App: Refactored the example application to use the latest AdminJS version and ES modules
• Update the tests to cover the new functionality
• Demonstrate EntitySchema Usage in the example app

Usage

Entity schemas can be utilized by passing them as an object that includes the schema and the DataSource already initialized.

new AdminJS({
  resources: [
    {
      schema: SomeSchema,
      dataSource,
    },
  ],
});