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/setup-env.js

@@ -0,0 +1,6 @@
+if (typeof process.env.DB_TEMP_NAME === "undefined") {
+  const tempName = parseInt(process.env.JEST_WORKER_ID || "1")
+  process.env.DB_TEMP_NAME = `medusa-integration-${tempName}`
+}
+
+process.env.MEDUSA_PRICING_DB_SCHEMA = "public"