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/scripts/migration-down.ts

@@ -0,0 +1,39 @@
+import * as PricingModels from "@models"
+
+import { LoaderOptions, Logger, ModulesSdkTypes } from "@medusajs/types"
+
+import { DALUtils, ModulesSdkUtils } from "@medusajs/utils"
+import { EntitySchema } from "@mikro-orm/core"
+
+/**
+ * This script is only valid for mikro orm managers. If a user provide a custom manager
+ * he is in charge of reverting the migrations.
+ * @param options
+ * @param logger
+ * @param moduleDeclaration
+ */
+export async function revertMigration({
+  options,
+  logger,
+}: Pick<
+  LoaderOptions<ModulesSdkTypes.ModuleServiceInitializeOptions>,
+  "options" | "logger"
+> = {}) {
+  logger ??= console as unknown as Logger
+
+  const dbData = ModulesSdkUtils.loadDatabaseConfig("pricing", options)!
+  const entities = Object.values(PricingModels) as unknown as EntitySchema[]
+
+  const orm = await DALUtils.mikroOrmCreateConnection(dbData, entities)
+
+  try {
+    const migrator = orm.getMigrator()
+    await migrator.down()
+
+    logger?.info("Pricing module migration executed")
+  } catch (error) {
+    logger?.error(`Pricing module migration failed to run - Error: ${error}`)
+  }
+
+  await orm.close()
+}