Introduce @SentenceFragment for IndicativeSentences DisplayNameGenerator

[sbrannen]

Overview

This PR introduces @⁠SentenceFragment for the IndicativeSentences DisplayNameGenerator.

Related Issues

• Introduce @SentenceFragment for use with IndicativeSentences DisplayNameGenerator #4347

Definition of Done

• There are no TODOs left in the code
• Method preconditions are checked and documented in the method's Javadoc
• Coding conventions (e.g. for logging) have been followed
• Change is covered by automated tests including corner cases, errors, and exception handling
• Public API has Javadoc and @API annotations
• Change is documented in the User Guide and Release Notes

[sbrannen]

With the status quo of this PR, the following test class...

class DisplayNameGeneratorDemo {

	@Nested
	@IndicativeSentencesGeneration
	@SentenceFragment("A year is a leap year")
	class LeapYearTests {

		@Nested
		@SentenceFragment("(nested)")
		class NestedTests {

			@ParameterizedTest(name = "{0}")
			@ValueSource(ints = { 2016, 2020, 2048 })
			@SentenceFragment("if it is one of the following years")
			void validLeapYear(int year) {
			}
		}
	}
}

Results in a test tree like: