Introduce support for sorting by aliased projections

[gregturn]

Original: #2863

[mp911de]

How is this even remotely possible? While properties are string, do we rewrite the sort to contain a function?

[gregturn]

This check for functions in Sort is something we already look for in QueryUtils.

https://github.com/spring-projects/spring-data-jpa/blob/main/spring-data-jpa/src/main/java/org/springframework/data/jpa/repository/query/QueryUtils.java#L342-L357

In fact, we have existing test cases like this:

	@Test // DATAJPA-148
	void doesNotPrefixSortsIfFunction() {

		StringQuery query = new StringQuery("select p from Person p", true);
		Sort sort = Sort.by("sum(foo)");

		QueryEnhancer enhancer = getEnhancer(query);

		assertThatThrownBy(() -> enhancer.applySorting(sort, "p")) //
				.isInstanceOf(InvalidDataAccessApiUsageException.class);
	}

I'm simply trying to apply the same safeguards in our parser code.

[mp911de]

Can we please have the same for JPQL? It's the same topic, after all. Please, also rebase this PR.