Added OpenTelemetry Java Agent for auto-instrumentation

[chgl]

This adds the https://github.com/open-telemetry/opentelemetry-java-instrumentation agent jar to the container to allow tracing and metrics export without any code changes.

It can be enabled by setting the following environment variables:

      JAVA_OPTS: "-javaagent:/var/lib/ohdsi/webapi/opentelemetry-javaagent.jar"
      OTEL_TRACES_EXPORTER: "jaeger"
      OTEL_METRICS_EXPORTER: "prometheus"
      OTEL_LOGS_EXPORTER: "none"
      OTEL_SERVICE_NAME: "ohdsi-webapi"
      OTEL_EXPORTER_JAEGER_ENDPOINT: "http://jaeger:14250"

see https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/sdk-environment-variables.md for details on the settings.

Here's a complete Docker Compose setup:

services:
  db:
    image: docker.io/library/postgres:14.5@sha256:f8816ada742348e1adfcec5c2a180b675bf6e4a294e0feb68bd70179451e1242
    environment:
      POSTGRES_PASSWORD: postgres
      POSTGRES_DB: ohdsi

  jaeger:
    image: docker.io/jaegertracing/all-in-one:1.37@sha256:60ab2e6b0682f79a4e42b2bd2526ac4de80a3a7a1ef136c71dc0cb85e9c50f46
    ports:
      - 127.0.0.1:16686:16686

  webapi:
    image: docker.io/library/webapi:latest
    ports:
      - 127.0.0.1:8080:8080
      - 127.0.0.1:9464:9464
    environment:
      DATASOURCE_DRIVERCLASSNAME: org.postgresql.Driver
      DATASOURCE_OHDSI_SCHEMA: ohdsi
      DATASOURCE_PASSWORD: postgres
      DATASOURCE_URL: jdbc:postgresql://db:5432/ohdsi
      DATASOURCE_USERNAME: postgres
      FLYWAY_DATASOURCE_DRIVERCLASSNAME: org.postgresql.Driver
      FLYWAY_DATASOURCE_PASSWORD: postgres
      FLYWAY_DATASOURCE_URL: jdbc:postgresql://db:5432/ohdsi
      FLYWAY_DATASOURCE_USERNAME: postgres
      FLYWAY_PLACEHOLDERS_OHDSISCHEMA: ohdsi
      FLYWAY_SCHEMAS: ohdsi
      SECURITY_CORS_ENABLED: "false"
      SPRING_BATCH_REPOSITORY_TABLEPREFIX: ohdsi.BATCH_
      SPRING_JPA_PROPERTIES_HIBERNATE_DEFAULT_SCHEMA: ohdsi
      SPRING_JPA_PROPERTIES_HIBERNATE_DIALECT: org.hibernate.dialect.PostgreSQLDialect
      JAVA_OPTS: "-javaagent:/var/lib/ohdsi/webapi/opentelemetry-javaagent.jar"
      OTEL_TRACES_EXPORTER: "jaeger"
      OTEL_METRICS_EXPORTER: "prometheus"
      OTEL_LOGS_EXPORTER: "none"
      OTEL_SERVICE_NAME: "ohdsi-webapi"
      OTEL_EXPORTER_JAEGER_ENDPOINT: "http://jaeger:14250"

• View traces at http://localhost:16686/
  

• see metrics in prometheus format at http://localhost:9464/
  

Closes #2066

[leeevans]

LGTM