Add Location lookup to API SDK, WebApi, CLI.

[gfmatthews]

Adding reference to an existing GSF issue Green-Software-Foundation/carbon-aware-sdk#175

Description

As a Carbon Aware application developer, I want to list all the locations definitions as part of an WebApi endpoint, cli command and GSF.CarbonAware handler.

Acceptance Criteria

• [X] List all the location instances loaded from the json files definitions
• [X] Be able to use WebApi, CLI and SDK to list all locations entries.
• [X] Unit Tests are completed and code passes tests

Dependencies

Task List

• [X] Enhance WebApi to add new route /locations
• [X] Enhance CLI commands with new command locations
• [X] Enhance GSF.CarbonAware SDK to include new Locations handler.
• [X] Add Unit tests
• [X] Add Integrations tests
• [X] Update documentation

[juzuluag]

Adding reference to #214

[juzuluag]

PR: Green-Software-Foundation#239