[Config] Capture body

[jackshirazi]

Classic agent link

• https://www.elastic.co/guide/en/apm/agent/java/current/config-core.html#config-capture-body

What it does

For transactions that are HTTP requests, the Java agent can optionally capture the request body (e.g. POST variables). For transactions that are initiated by receiving a message from a message broker, the agent can capture the textual message body.

Implementation difficulty, location, and dynamism

• Already implemented
• https://opentelemetry.io/docs/zero-code/java/agent/configuration/#capturing-servlet-request-parameters
• https://opentelemetry.io/docs/zero-code/java/agent/configuration/#capturing-consumer-message-receive-telemetry-in-messaging-instrumentations
• Not dynamic

@akhileshpok please feedback on whether this really needs to be supported as a dynamic capability