Messages should interact more gracefully with Java

[mpkorstanje]

🤔 What's the problem you're trying to solve?

While converting the plugins to use messages I'm running into some annoyances using the messages API.

✨ What's your proposed solution?

• Timestamp should use Timestamp(Long seconds, Integer nanos) to match Instants.getEpochSecond and getNano.
• Location should use Location(Integer line, Integer column). There are no instances were a string in Java can be addressed with a long.
• Same for Group(List<Group> children, Integer start, String value)

Implementing Comparators for Location and Timestamp could also help avoid some annoyances. (e.g. https://github.com/cucumber/query/blob/main/java/src/main/java/io/cucumber/query/TimestampComparator.java).

⛏ Have you considered any alternatives or workarounds?

No response

📚 Any additional context?

No response