JSpecify: support inference for calls to generic methods

[msridhar]

This will be a significant challenge in general, but maybe we can handle the common cases and do something useful without having a full technique. See here for one test case:

NullAway/nullaway/src/test/java/com/uber/nullaway/jspecify/GenericMethodTests.java

Line 137 in 7a3d088

public void genericMethodAndVoidTypeWithInference() {

[agrieve]

Hit this as well.

The specific case I ran into was in this form:

@NullMarked
public class Foo {
  public static class Key<T extends @Nullable Object> {}

  private static final Key<@Nullable Foo> KEY = new Key();

  public static <T extends @Nullable Object> void setValue(Key<T> key, T value) {
  }

  public static void main() {
    setValue(KEY, null);
  }
}

[msridhar]

Thanks for the example! We are working on this.