Improve JNI exception handling and logging

[CedNaru]

• Added Typed MethodID and made the JObject's method calls use them for type safety. Updated all JvmWrapper jni methods.
• Logging methods have been rewamped to allow formatting without vformat().
• Crash methods are gone, the only thing left that can explicitly crash the module are the DEV_ASSERT statements. As we progress toward a stable release, we already removed most of the crashes. I simply finished the last remaining ones. The new DEV_ASSERT statements are mostly related to JNI errors, which is not the type users should have to care about.
• LOG_ERROR_WITH_ALERT is also gone. Since Godot 4.3, errors are automatically displayed in the editor as small popups. It's not necessary to spawn our own alert window anymore.
• A new way to handle exceptions. The Env's methods are now much simpler, without difference in behavior between DEBUG and release. You can now set a custom "exception handler" that will be called instead of exceptionDescribe() when set. This handler is now set to be the method of a new singleton wrapper that takes a Throwable instance and print its stacktrace directly.

This is what it looks like when a JVM exception is handled from the C++ side with the new handler: