This is the core of the telemetry service client for the AWS Toolkit for Visual Studio Code

service-2.json is generated internally.

clienttelemetry.d.ts is autogenerated from service-2.json using the AWS JS SDK. This is incorporated into the
`postinstall` npm step.

\build-scripts\generateServiceClient.ts automates the process of generating clienttelemetry.d.ts

Client ID is generated and stored/retrieved in `createDefaultPublisher()`:
https://github.com/aws/aws-toolkit-vscode/blob/d3cd90c114b5be6b2cfabad4bfa5670f0b7adf60/src/shared/telemetry/defaultTelemetryService.ts#L163-L168