remove(key) {
    this.#storage.delete(key);

    if (this.#storage.size === 0) {
      this.resetModified();
    }

    if (typeof this.onAnnotationEditor === "function") {
      for (const value of this.#storage.values()) {
        if (value instanceof AnnotationEditor) {
          return;
        }
      }
      this.onAnnotationEditor(null);
    }
  }
Remove a value from the storage.
@param {string} key