FOUNDATIONS: Retrieve All Shelters

[Spectralgo]

Example of a merged Pull Request for FOUNDATIONS: Retrieve All [Entity]: https://github.com/hassanhabib/Taarafo.Core/pull/157

Helpful documentation: https://app.gitbook.com/o/xnkHrW3hLr8Q7LzRfdRW/s/KnbO71ijoRN4jS6hT7J7/docs/refugeeland.core/architecture/host-has-shelters https://docs.refugee.land/architecture-diagrams/refugeeland-project-architecture

The Standard - 2.1 Foundation Services : https://github.com/hassanhabib/The-Standard/blob/master/2.%20Services/2.1%20Foundations/2.1%20Foundations.md#21-foundation-services-broker-neighboring