google-java-format does not enforce rules 2.3.1 (inside strings) or 2.3.2

https://google.github.io/styleguide/javaguide.html#s2.3.1-whitespace-characters

The 2.3.1 problem is only in the sentence "All other whitespace characters in string and character literals are escaped": google-java-format doesn't replace a literal tab inside a string with \t.