Generate logging on SWODLR-API's GraphQL calls (mutations/query)

[joshgarde]

• Create an custom observation handler from which to log GraphQL requests (mutations/queries) to the console
• https://docs.micrometer.io/micrometer/reference/observation/components.html#micrometer-observation-handler
• https://docs.spring.io/spring-boot/docs/current/reference/html/actuator.html#actuator.observability