Prefer Class-File API on Java 24 or above

[Goooler]

Closes #474.

[JakeWharton]

While I generally want this, I think we don't win much with it. Only annoying any users we have that are running older than JDK 24. No one should be running old JDKs, but as we know most people generally do. Maybe once AGP requires JDK 24 (or newer) this will be less hostile of a change.

[Goooler]

Reasonable. Alternatively, there could be two impls for Java 24 newer or not (Multi-Release JAR?).

[Goooler]

tree ~/IdeaProjects/diffuse/diffuse/build/install

/Users/goooler/IdeaProjects/diffuse/diffuse/build/install
└── diffuse
    ├── bin
    │   ├── diffuse
    │   └── diffuse.bat
    └── lib
        ├── aapt2-proto-9.1.0-14792394.jar
        ├── annotations-13.0.jar
        ├── apksig-9.1.0.jar
        ├── asm-9.6.jar
        ├── auto-value-annotations-1.6.2.jar
        ├── binary-resources-32.1.0.jar
        ├── bundletool-1.18.3.jar
        ├── byteunits-0.9.1.jar
        ├── checker-qual-3.5.0.jar
        ├── clikt-jvm.jar
        ├── clikt-mordant-jvm.jar
        ├── colormath-jvm.jar
        ├── crossword-jvm.jar
        ├── dagger-2.28.3.jar
        ├── dalvik-dx-16.0.1.jar
        ├── diffuse-0.4.0-SNAPSHOT.jar
        ├── error_prone_annotations-2.11.0.jar
        ├── failureaccess-1.0.1.jar
        ├── formats-0.4.0-SNAPSHOT.jar
        ├── gson-2.8.9.jar
        ├── guava-30.1-jre.jar
        ├── io-0.4.0-SNAPSHOT.jar
        ├── j2objc-annotations-1.3.jar
        ├── java-diff-utils-4.16.jar
        ├── javax.inject-1.jar
        ├── jna-5.14.0.jar
        ├── jose4j-0.9.5.jar
        ├── jsr305-3.0.2.jar
        ├── kotlin-stdlib-2.3.20-RC3.jar
        ├── kotlin-stdlib-jdk7-1.9.10.jar
        ├── kotlin-stdlib-jdk8-1.9.10.jar
        ├── listenablefuture-9999.0-empty-to-avoid-conflict-with-guava.jar
        ├── mordant-jvm-ffm-jvm.jar
        ├── mordant-jvm-graal-ffi-jvm.jar
        ├── mordant-jvm-jna-jvm.jar
        ├── mordant-jvm.jar
        ├── mordant-omnibus-jvm.jar
        ├── okio-jvm-3.16.4.jar
        ├── picnic-jvm.jar
        ├── protobuf-java-4.34.0.jar
        ├── protobuf-java-util-3.22.3.jar
        ├── reports-0.4.0-SNAPSHOT.jar
        └── slf4j-api-1.7.30.jar

4 directories, 45 files

sh ~/IdeaProjects/diffuse/diffuse/build/install/diffuse/bin/diffuse diff --jar ~/Downloads/old.jar ~/Downloads/new.jar

OLD: old.jar
NEW: new.jar

 JAR   │ old     │ new     │ diff  
───────┼─────────┼─────────┼───────
 class │ 1.2 KiB │ 1.2 KiB │ +59 B 
 other │    72 B │    72 B │   0 B 
───────┼─────────┼─────────┼───────
 total │ 1.3 KiB │ 1.3 KiB │ +59 B 

 CLASSES │ old │ new │ diff       
─────────┼─────┼─────┼────────────
 classes │   1 │   1 │  0 (+0 -0) 
 methods │   4 │   5 │ +1 (+1 -0) 
  fields │   1 │   1 │  0 (+0 -0) 

=================
====   JAR   ====
=================

 size    │ diff  │ path                       
─────────┼───────┼────────────────────────────
 1.2 KiB │ +59 B │ ∆ org/example/MainKt.class 
─────────┼───────┼────────────────────────────
 1.2 KiB │ +59 B │ (total)                    


=====================
====   CLASSES   ====
=====================

METHODS:

   old │ new │ diff       
  ─────┼─────┼────────────
   4   │ 5   │ +1 (+1 -0) 
  
  + org.example.MainKt main2()