feat(codecs): introduce OTLP decoder (#24003)

* feat(codecs): introduce OTLP decoder and use it internally for the OTEL source

* make fmt

* add changelog

* generate docs

* clippy fix

* make fmt

* code golfing and tests

* fix schema definition

* make fmt

* remove unusused import

* improve docs

* improve test: validate trace ID and spand ID

* fmt linux