@CanIgnoreReturnValue
      public Entry withRandomId() {
        this.strategy = KeyIdStrategy.randomId();
        return this;
      }
Tells Tink to assign an unused uniform random id when this keyset is built.

<p>Using {@code withRandomId} is invalid for an entry with an imported or preexisting key,
which has an ID requirement.

<p>If an entry is marked as {@code withRandomId}, all subsequent entries also need to be
marked with {@code withRandomId}, or else calling {@code build()} will fail.
java_src/src/main/java/com/google/crypto/tink/KeysetHandle.java