Add Item Presets

[Razzmatazzz]

Do we want to add all the item presets (mostly weapon presets) to the API? This would allow the API to be a bit more specific when certain weapon variants are available for purchase/barter. The item presets are mostly available via the tarkovdata repo. There are a couple challenges, though:

First, not all weapon variants that are available for purchase/barter have an official "preset" with a bsg-assigned ID. One example is the scoped mosin that can be bartered with Prapor for batteries. We could include such "presets" for the sake of being comprehensive, but that raises the question of what pseudo-ID we would assign to them.

Second, there isn't a great way to determine which preset items are being bartered for on the wiki. In the case of weapons, they all link to the main weapon page. The image is of the preset, but it's difficult to use the image to match it to a preset. It may be possible to check the image on the barter trades wiki page against the images in the weapon variants section of the weapon page, but not all bartered weapon configurations have corresponding weapon variant entries on their main weapon pages.