feat(pricing, types, utils, medusa-sdk): Pricing Module Setup + Currency (#4860)

What:

- Setups the skeleton for pricing module
- Creates service/model/repository for currency model
- Setups types
- Setups DB
- Moved some utils to a common place

RESOLVES CORE-1477
RESOLVES CORE-1476

packages/pricing/src/module-definition.ts

@@ -0,0 +1,12 @@
+import { ModuleExports } from "@medusajs/types"
+import { PricingModuleService } from "@services"
+import loadConnection from "./loaders/connection"
+import loadContainer from "./loaders/container"
+
+const service = PricingModuleService
+const loaders = [loadContainer, loadConnection] as any
+
+export const moduleDefinition: ModuleExports = {
+  service,
+  loaders,
+}