Add missing authorization header

[masl2]

Description

Explicitly add the Authorization header to API requests specification

Context

The Authorization header is used as part of Application Level 3 security patterns when accessing proxy resources. This functionality is supported and required by the API for identifying API consumers.

However, this header has not been explicitly stated as part of the API requests specification and so is not present in the OAS documentation or the derived SDKs.

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 am familiar with the contributing guidelines
• 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

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Sensitive Information Declaration

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