This commit introduces an internal SortedProperties class that is a
specialization of java.util.Properties which sorts properties
alphanumerically based on their keys.

This can be useful when storing a java.util.Properties instance in a
properties file, since it allows such files to be generated in a
repeatable manner with consistent ordering of properties.

Comments in generated properties files can also be optionally omitted.

An instance of SortedProperties can be created via two new
createSortedProperties() factory methods in
org.springframework.core.CollectionFactory.

Closes gh-23018