Implement a Cucumber Messages reader

The Cucumber's 'message' reporter writes the Cucumber Messages in a newline-delimited JSON file. Cucumber advises using this format instead of Cucumber JSON, which they consider legacy.

We should support this new format with a new reader.

#### Useful links

- [The GitHub repository](https://github.com/cucumber/messages) that documents the protocol.
- [The JSON schemas](https://github.com/cucumber/messages/tree/main/jsonschema)
- [The message format description](https://github.com/cucumber/messages/blob/main/messages.md)

Start with the Cucumber Messages repository, especially the protocol description and JSON schemas linked in the issue, to understand the newline-delimited format. Then locate the project's existing report readers and determine how a new reader fits their interfaces. Done means the reader can consume Cucumber Messages files and expose their contents to Allure reporting.

Written by the indexing model from the issue text.