Add DataPath util

[MinnDevelopment]

Pull Request Etiquette

• [x] I have checked the PRs for upcoming features/bug fixes.
• [x] I have read the contributing guidelines.

Changes

• [ ] Internal code
• [x] Library interface (affecting end-user code)
• [ ] Documentation
• [ ] Other: _____

Closes Issue: NaN

Description

This new util class allows to access deep nested fields with a simple path expression.

Example

long value = DataPath.getLong(object, "data.options[0].value");

This also allows safe-calls similar to kotlin via ?. delimiters:

long value = DataPath.getLong(object, "data?.options?[0]?.value?", 0L);

This would be equivalent to:

long value = 0L;
DataObject data = object.optObject("data").orElse(null);
if (data != null)
{
  DataArray options = data.optArray("options").orElse(null);
  if (options != null)
    value = options.getLong("value", 0L);
}

I'm sure you can see the appeal.

Motivation

This is very useful in various places, and now also relevant in the case of Event#getRawData which usually only is used to access a specific part of the json payload. Previously, you would have to exhaustively get each object and array down the path, which is especially annoying with optionals.

TODO

• [x] Array equivalent methods for each type
• [x] Documentation for all the new getters, including examples
• [x] Unit tests