Enable Custom Repository at Eclipse JNoSQL

[otaviojava]

To enhance the flexibility and functionality of Eclipse JNoSQL, we need to enable the creation and use of custom repositories.

Tasks:

• [ ] Review the current repository implementation in Eclipse JNoSQL.
• [ ] Define the requirements and design for custom repositories.
• [ ] Implement the necessary changes to support custom repositories.
• [ ] Create documentation and examples on how to create and use custom repositories.
• [ ] Test the new functionality to ensure it works as expected.