Make logs format compatible with OpenTelemetry event

Problem/Motivation

Now logs submitted by the opentelemetry_logs module put the OpenTelemetry\API\Logs\LogRecord object as the log body, which leads to the empty body received in the OpenTelemetry receiver.

The right way is to put the array of data there instead.

Steps to reproduce

Proposed resolution

Put the $payload array with data instead of the LogRecord object.

Remaining tasks

User interface changes

API changes

Data model changes