[4/n]: migrate the RESTAPI GET /rest/* to use TwentyORM directly

[pacyL2K19]

This PR

🚧 WIP

• Addressing Make REST API use Twenty ORM direclty #3644

[greptile-apps]

PR Summary

This PR migrates the GET endpoint in the REST API to use TwentyORM directly instead of going through GraphQL, improving performance by removing the intermediate GraphQL layer.

• Added new RestApiCoreServiceV2 in /packages/twenty-server/src/engine/api/rest/core/rest-api-core-v2.service.ts to handle direct TwentyORM operations
• Implemented filter processing system in getWhereFilter method but currently commented out in the GET implementation
• Added FilterInputFactory to RestApiModule for handling query filter parameters
• Switched GET endpoint in RestApiCoreController to use restApiCoreServiceV2.get() with RestApiExceptionFilter
• Commented out RequestMethod.GET from MIGRATED_REST_METHODS in app.module.ts to indicate work in progress

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