[detectors/akamai] Contribute akamai detector from resourcedetectionprocessor #8959

Problem Statement

collector-contrib/processor/resourcedetectionprocessor/internal/akamai implements a resource detector for the Akamai Connected Cloud (Linode) platform. There is currently no equivalent in go-contrib/detectors/, which means Akamai detection is only available to collector-contrib pipelines and not to any Go SDK user.

Proposed Solution

Add a new detectors/akamai package implementing the Akamai detector as a resource.Detector, ported from the collector-contrib implementation, so that collector-contrib/processor/resourcedetectionprocessor can delegate to it and any other Go SDK user can adopt it.

Prior Art

• Collector-contrib implementation to port from: processor/resourcedetectionprocessor/internal/akamai
• Tracking issue: [processor/resourcedetection] Align detectors with opentelemetry-go SDK detectors opentelemetry-collector-contrib#48159

Additional Context

What the collector-contrib detector does:

• Queries the Akamai/Linode Instance Metadata Service.
• Emits: cloud.provider (akamai), cloud.platform, cloud.region, host.id, host.name, host.type.