Emit load generator logs via OTLP

[austinlparker]

Changes

fixes #844. load generator now emits logs via OTLP to OpenSearch.

Merge Requirements

For new features contributions please make sure you have completed the following
essential items:

• CHANGELOG.md updated to document new feature additions
• Appropriate documentation updates in the [docs][]
• Appropriate Helm chart updates in the [helm-charts][]

[julianocosta89]

LGTM but there is not much being logged.

Should we add more logs to it, or keep it like that?

Also, the logs that are being created are not part of a Trace, hence they do not have TraceID and SpanID attached to them.

[austinlparker]

I think it's fine for now? The logs can't be associated with a trace because they're part of the locust initialization process.