feat(medusa): Convert SwapService to TypeScript (#2000)

**What**
- refactor swap service to typescript
- reimplement legacy methods
- use enums instead of magic strings

RESOLVES CORE-396

Co-authored-by: Oliver Windall Juhl <59018053+olivermrbl@users.noreply.github.com>

packages/medusa/src/migrations/1661863940645-swap_fulfillment_status_requires_action.ts

@@ -0,0 +1,33 @@
+import { MigrationInterface, QueryRunner } from "typeorm"
+
+export class swapFulfillmentStatusRequiresAction1661863940645
+  implements MigrationInterface
+{
+  name = "swapFulfillmentStatusRequiresAction1661863940645"
+
+  public async up(queryRunner: QueryRunner): Promise<void> {
+    await queryRunner.query(
+      `ALTER TYPE "swap_fulfillment_status_enum" RENAME TO "swap_fulfillment_status_enum_old"`
+    )
+    await queryRunner.query(
+      `CREATE TYPE "swap_fulfillment_status_enum" AS ENUM('not_fulfilled', 'fulfilled', 'shipped', 'partially_shipped', 'canceled', 'requires_action')`
+    )
+    await queryRunner.query(
+      `ALTER TABLE "swap" ALTER COLUMN "fulfillment_status" TYPE "swap_fulfillment_status_enum" USING "fulfillment_status"::"text"::"swap_fulfillment_status_enum"`
+    )
+    await queryRunner.query(`DROP TYPE "swap_fulfillment_status_enum_old"`)
+  }
+
+  public async down(queryRunner: QueryRunner): Promise<void> {
+    await queryRunner.query(
+      `CREATE TYPE "swap_fulfillment_status_enum_old" AS ENUM('not_fulfilled', 'fulfilled', 'shipped', 'canceled', 'requires_action')`
+    )
+    await queryRunner.query(
+      `ALTER TABLE "swap" ALTER COLUMN "fulfillment_status" TYPE "swap_fulfillment_status_enum_old" USING "fulfillment_status"::"text"::"swap_fulfillment_status_enum_old"`
+    )
+    await queryRunner.query(`DROP TYPE "swap_fulfillment_status_enum"`)
+    await queryRunner.query(
+      `ALTER TYPE "swap_fulfillment_status_enum_old" RENAME TO "swap_fulfillment_status_enum"`
+    )
+  }
+}