Add OTel Instrumenation for Java and Node.JS

[KarstenSchnitter]

Adds documentation how to use SAP Cloud Logging exporters for Java and Node.JS with
SAP Cloud Logging in the Cloud Foundry environment. Contains procedure for user-provided
services.

[cla-assistant]

All committers have signed the CLA.

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[juergen-walter]

Page where it shall be rendered to https://help.sap.com/docs/cloud-logging/cloud-logging/ingest-via-opentelemetry-api-endpoint?version=Cloud

[Madeline-Schaefer]

Changes are available in the draft version: https://help.sap.com/docs/cloud-logging/cloud-logging/ingest-via-opentelemetry-api-endpoint?state=DRAFT&version=Cloud

[juergen-walter]

Looks good, send to production please