Add Enabled to LogRecordProcessor

[pellared]

What are you trying to achieve?

A "hook" for Logger.Enabled for customization and flexibility via extending LogRecordProcessor with Enabled opt-in operation.

Additional context.

Created per:

• OTEP: Logger.Enabled #4290

Working implementation in OTel Go:

• sdk/log: Add FilterProcessor and EnabledParameters opentelemetry-go#6317