Add support to purchase cosmetics with in-game currency (#3648)

## Description:

Caps & Plutonium can be used to purchase different cosmetics. 

* The cosmetic button can display pluto/caps/dollars
* Create a "purchaseCosmetic" helper function that handles purchase
logic

## Please complete the following:

- [x] I have added screenshots for all UI updates
- [x] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [x] I have added relevant tests to the test directory
- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced

## Please put your Discord username so you can be contacted if a bug or
regression is found:

evan

src/core/CosmeticSchemas.ts

@@ -56,6 +56,8 @@ const CosmeticSchema = z.object({
   name: CosmeticNameSchema,
   affiliateCode: z.string().nullable(),
   product: ProductSchema.nullable(),
+  priceSoft: z.number().optional(),
+  priceHard: z.number().optional(),
   artist: z.string().optional(),
   rarity: z
     .enum(["common", "uncommon", "rare", "epic", "legendary"])