Add multiple AlsoUsableFor for autotype

[wherewhere]

In C++, we can have:

class _jobject {};
class _jarray : public _jobject {};
class _jbooleanArray : public _jarray {};

typedef _jobject *jobject;
typedef _jarray *jarray;
typedef _jbooleanArray *jbooleanArray;

So that jbooleanArray can implicit convert to jarray and jobject. Now we can use [AlsoUsableFor("jarray")] to mark jbooleanArray can implicit convert to jarray or [AlsoUsableFor("jobject")] to mark jbooleanArray can implicit convert to jobject, but we cannot mark them both. If we mark the [AlsoUsableFor("jarray")] for jbooleanArray and [AlsoUsableFor("jobject")] for jarray, we need to implicit convert jbooleanArray to jarray and then implicit convert it to jobject. For example:

JValue* _args = stackalloc JValue[1];
JClass stringClass = env->functions->FindClass.CreateDelegate<FindClass>().Value(env, "java/lang/String"u8.AsPCSTR());
_args[0].l = (JArray)env->functions->NewObjectArray.CreateDelegate<NewObjectArray>().Value(env, 0, stringClass, default);
env->functions->CallStaticVoidMethodA.CreateDelegate<CallStaticVoidMethodA>().Value(env, mainClass, entryPoint, _args);

So, it will be better if we can have [AlsoUsableFor(["jarray", "jobject"])] or can multiple mark AlsoUsableFor like [AlsoUsableFor(["jarray"])][AlsoUsableFor("jobject")] so that we can direct implicit convert jbooleanArray to jobject.