`@Elements` converter for collection-like string representations

[scordio]

A new @Elements composed annotation could be added to convert collection-like strings to JDK types, e.g., arrays, List, Iterable, Collection, Set, Map, etc. Their Sequenced variants should also be supported.

The underlying JUnit conversion capabilities could serve as a delegate for converting each element.

The converter should support common string representations, like:

Array / List / Collection / Iterable

• JSON-style: [1, 2, 3]
• CSV-style like 1, 2, 3 (would likely not work when used in combination with @CsvSource, but maybe that use case could be supported with a configurable delimiter, e.g., 1; 2; 3 , 1|2|3)

Set

• Curly braces: {1, 2, 3}
• Square brackets: [1, 2, 3]