MethodInvocation and MethodReference should be extracted into input for method reference

[sabaka]

MethodInvocation and MethodReference should be extracted into java code like in https://github.com/sabaka/checkstyle/blob/2d406453da73c4c34a4d328b2ea5f4bfc2d8b577/src/test/resources-noncompilable/com/puppycrawl/tools/checkstyle/grammars/java8/InputMethodReferences5_LeftPart.java according to
https://docs.oracle.com/javase/specs/jls/se8/html/jls-15.html#jls-MethodInvocation
https://docs.oracle.com/javase/specs/jls/se8/html/jls-15.html#jls-MethodReference