Feature/gpcapim 255 controller integration

[Vox-Ben]

Description

Creates the controller class that orchestrates calls to the other gateway components and to the GP provider. Integrates this with the API requests entry point, the PDS search module and the GP provider module.

Supersedes #49

Context

This module is needed so that we have something that actually calls all the components that we need to call and manages their responses.

Type of changes

• Refactoring (non-breaking change)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would change existing functionality)
• Bug fix (non-breaking change which fixes an issue)

Checklist

• I have followed the code style of the project
• I have added tests to cover my changes
• I have updated the documentation accordingly
• This PR is a result of pair or mob programming
• Exceptions/Exclusions to coding standards (e.g. #noqa or #NOSONAR) are included within this Pull Request.

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• I confirm that neither PII/PID nor sensitive data are included in this PR and the codebase changes.