Allow using operators in otlp logs receiver

[kushal-ti]

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Is your feature request related to a problem? Please describe. I'm using the OTLP receiver for collecting logs into the otel collector. The body of my logs is JSON but is always parsed as a string by the receiver. I maybe able to use json_parser operator for this purpose, but the otlp receiver doesn't support operators

Describe the solution you'd like Allowing support for operators in otlp receiver

Describe alternatives you've considered Using a filelog receiver instead of otlp receiver, however, this can be a headache in containerized environments like k8s and brings other problems like log rotations and log management with it