hub http-gateway: add api/v1/things endpoint

Summary by CodeRabbit

New Features
- Introduced functionality to retrieve resource links for devices via the new /things endpoint.
Tests
- Added tests for the new /things endpoint, ensuring proper retrieval and formatting of device resources.
Refactor
- Improved JSON unmarshalling in HTTP gateway tests for enhanced error handling.
Documentation
- Updated usage of constants and parameters in virtual device creation to support conditional resource addition based on the device description availability.

Apr 25 '24 16:04 Danielius1922

Walkthrough

The recent updates to the http-gateway service encompass improvements in handling requests and responses, introducing new functionalities, and enhancing error management. Notable changes include refining function behaviors, updating signatures, and integrating new features like managing resources with specific content. These modifications aim to enhance the service's capabilities and streamline its operations.

Changes

File(s)	Change Summary
`http-gateway/service/getResource.go`, `http-gateway/service/getDevice.go`	Refactored functions for better error handling and response parsing, updated signatures.
`http-gateway/service/getThings.go`	Introduced new types and functions for managing thing descriptions and security configurations.
`http-gateway/service/requestHandler.go`	Added a new field to `RequestHandler`, updated `NewRequestHandler` function, and included a new handler for things.
`http-gateway/service/service.go`	Updated the `NewRequestHandler` function call with an additional argument.
`http-gateway/service/updateResource.go`	Refactored `updateResource` function to handle query parameters and errors differently.
`http-gateway/service/getDeviceResourceLinks.go`, `http-gateway/service/deleteDevice.go`	Added a boolean argument to the `toSimpleResponse` function calls.
`http-gateway/service/getResource_test.go`	Added a new test function to fetch a resource with only content.
`http-gateway/test/http.go`	Introduced a method to set query parameters in `RequestBuilder`.
`http-gateway/uri/uri.go`	Added new constants and updated paths for devices and things.
`Makefile`	Updated variables and added new targets for setting up and running a bridge device simulator in Docker containers.

🐇 In code's vast and winding maze, Refactors bring new dawn's rays. Functions tuned with care and might, To make our gateway's future bright. Constants, paths, and things anew, In Docker’s world, simulations grew. Hopping forward, changes blend, In harmony, our code ascends. 🚀

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