Codecs defined with "options" do not show `encode` or `decode` statistics

[robbavey]

Logstash information:
8.14.3

Steps to reproduce:

Setup a pipeline, and configure a codec with options, rather than just as a "vanilla" codec:

input { 
  stdin {
    codec => json { id => "json" }
  }
}

curl http://localhost:9601/_node/stats | jq '.pipelines.main.plugins.codecs.[0]'

{
  "id": "json",
  "name": "json"
}

Defining the same config without an option

input { 
  stdin {
    codec => json
  }
}

, the stats show up as expected:

{
  "id": "json_792305d6-0a67-4f8c-9d54-604f15c06113",
  "decode": {
    "duration_in_millis": 0,
    "writes_in": 0,
    "out": 0
  },
  "name": "json",
  "encode": {
    "duration_in_millis": 0,
    "writes_in": 0
  }
}