types(aggregate): add $firstN, $lastN, $bottom, $bottomN, $minN and $maxN operators

[mlomnicki]

Fixes #15086

Summary

Adds TypeScript support for the $firstN, $lastN, $bottom, $bottomN, $minN and $maxN operators

Examples

GameEntry.aggregate([
  {
     $sort: { score: -1 }
  },
  {
     $group: {
       _id: '$gameId',
      maxScores: {
        $firstN: { input: '$score', n: 3 }
     }  
  }
]);