Add Location lookup to API SDK, WebApi, CLI.

[gfmatthews]

Adding reference to an existing GSF issue Green-Software-Foundation#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

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

Dependencies

Task List

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

[juzuluag]

Adding reference to #214

[juzuluag]

PR: Green-Software-Foundation#239