Add support for attempt scramble and solution/reconstruction

[mintydev789]

The Attempt type should be expanded to something like this:

type Attempt = {
  // The result format is described in the exports README
  result: number;
  memo?: number;
  scramble?: string;
  solution?: string;
};

Events should also be expanded with a hasScrambles and a hasSolutions column.

It should then be possible to enter the scramble and solution on the data entry page via two new inputs. Those inputs should only be shown if the corresponding event option is enabled. It should be possible to leave them empty. The video-based results submission page should also include a scramble input, if the event has hasScrambles === true.