Apply code polishing to leverage various Java 17 structures.

[shin-mallang]

I fixed methods that didn't use instanceof pattern matching to use it.

I didn't apply it to the equal method because it seemed to generate without using instanceof pattern matching.

I also didn't apply it to the following part of HibernateUtils because it was ambiguous to apply, but if you have a good recommendation, I will apply it.

if (query instanceof Query) {
    return ((Query<?>) query).getQueryString();
}

[shin-mallang]

And I have a question.

#3053 (comment)
Contrary to what you mentioned here, I found that instanceof was not applied correctly.

One example is the applySorting(Sort sort, @Nullable String alias) method that exists inside the JSqlParserQueryEnhancer.

The implementation of that code includes the following code.

if (selectStatement.getSelectBody()instanceof SetOperationList setOperationList) {
	return applySortingToSetOperationList(setOperationList, sort);
} else if (!(selectStatement.getSelectBody() instanceof PlainSelect)) {
	return queryString;
}

If that's not what you intended, may I modify this to make it conform to the convention.

[gregturn]

if (selectStatement.getSelectBody()instanceof SetOperationList setOperationList) {
	return applySortingToSetOperationList(setOperationList, sort);
} else if (!(selectStatement.getSelectBody() instanceof PlainSelect)) {
	return queryString;
}

Looks like the !( prefix somehow breaks IntelliJ and the Adapter for Eclipse Code Formatter of removing the space and allows it to format properly. Anyway, I've applied your code polishings to the code base and applied an additional commit on top of your existing ones along with a little bit of reformatting to the changelogs.

Thank you for your efforts @shin-mallang!

[gregturn]

Merged to main. Backported to 3.1.x.