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/integration-tests/__fixtures__/currency/data.ts

@@ -0,0 +1,20 @@
+export const defaultCurrencyData = [
+  {
+    symbol: "$",
+    name: "US Dollar",
+    symbol_native: "$",
+    code: "USD",
+  },
+  {
+    symbol: "CA$",
+    name: "Canadian Dollar",
+    symbol_native: "$",
+    code: "CAD",
+  },
+  {
+    symbol: "€",
+    name: "Euro",
+    symbol_native: "€",
+    code: "EUR",
+  },
+]

packages/pricing/integration-tests/__fixtures__/currency/index.ts

@@ -0,0 +1,20 @@
+import { SqlEntityManager } from "@mikro-orm/postgresql"
+import { Currency } from "@models"
+import { defaultCurrencyData } from "./data"
+
+export async function createCurrencies(
+  manager: SqlEntityManager,
+  currencyData: any[] = defaultCurrencyData
+): Promise<Currency[]> {
+  const currencies: Currency[] = []
+
+  for (let curr of currencyData) {
+    const currency = manager.create(Currency, curr)
+
+    currencies.push(currency)
+  }
+
+  await manager.persistAndFlush(currencies)
+
+  return currencies
+}