Lodash vs Vanila

Make benchmarks that test Lodash vs Vanila:

- [ ] _.concat vs Array.prototype.concat
- [ ] _.drop vs Array.prototype.splice
- [ ] _.findIndex vs Array.prototype.indexOf
- [ ] _.find vs Array.prototype.indexOf
- [ ] _.flatten vs Array.prototype.flat
- [ ] _.join vs Array.prototype.join
- [ ] _.reverse vs Array.prototype.reverse
- [ ] _.filter vs Array.prototype.filter
- [ ] _.includes vs Array.prototype.includes
- [ ] _.reduce vs Array.prototype.reduce
- [ ] _.some vs Array.prototype.some
- [ ] _.now() vs Date.prototype.getTime

No file, test, or entry point is named; first inspect the repository to find how existing benchmarks are organized and run. Implement benchmark coverage for each Lodash versus native API pair listed in the issue, and consider the work done when all twelve comparisons execute consistently with the repository's existing benchmark setup.

Written by the indexing model from the issue text.