[DOCS] Add grok and dissect support for runtime fields #68422
Description
#68088 added grok and dissect support for runtime fields. After talking with @nik9000, we should expand the runtime fields examples to include child pages specifically for grok and dissect. The new structure will have users index some fields and ingest data like on the current examples page, but then introduce new examples for grok and dissect that will operate on this data.
Grok example:
PUT localhost:9200/logs/_mappings
{
"runtime" : {
"message.clientip" : {
"type" : "ip",
"script": "emit(grok('%{COMMONAPACHELOG}').extract(doc["message"].value)?.clientip)"
}
}
}