Tenzir's JSON parser supports schema inference with an opt-out mechanism. For consistency, we want to bring the same functionality to other parsers where the schema is not already part of the data.
### Definition of Done
- [x] Support schema inference in the `xsv` parser
- [x] Support schema inference in the `cef` parser
Tenzir's JSON parser supports schema inference with an opt-out mechanism. For consistency, we want to bring the same functionality to other parsers where the schema is not already part of the data.