chore: added granular otel apps

example-apps/otel/serverless-otlp-format-grpc/README.md

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+# Serverless OpenTelemetry OTLP traces and metrics
+
+## Requirements
+
+- Choose an [OTLP acceptor endpoint](https://www.ibm.com/docs/en/instana-observability/current?topic=instana-backend#endpoints-of-the-instana-backend-otlp-acceptor).
+- Read the x-instana-key from the agent installation docs of the target SaaS instance.
+
+## Installation
+
+```sh
+npm install @grpc/grpc-js --save
+npm install @opentelemetry/api --save
+npm install @opentelemetry/auto-instrumentations-node --save
+npm install @opentelemetry/exporter-metrics-otlp-grpc --save
+npm install @opentelemetry/exporter-trace-otlp-grpc --save
+npm install @opentelemetry/host-metrics --save
+npm install @opentelemetry/instrumentation-kafkajs --save
+npm install @opentelemetry/sdk-metrics --save
+npm install @opentelemetry/sdk-node --save
+npm install express --save
+npm install kafkajs --save
+```
+
+## Start
+
+```sh
+INSTANA_KEY=xxx OTEL_EXPORTER_OTLP_ENDPOINT=yyy OTEL_LOG_LEVEL=debug OTEL_SERVICE_NAME=node-otlp-grpc npm start
+
+node kafka-consumer.js
+```