chore(): Reorganize modules (#7210)

**What**
Move all modules to the modules directory

packages/modules/tax/src/loaders/providers.ts

@@ -0,0 +1,43 @@
+import { moduleProviderLoader } from "@medusajs/modules-sdk"
+
+import { LoaderOptions, ModuleProvider, ModulesSdkTypes } from "@medusajs/types"
+import { Lifetime, asFunction } from "awilix"
+
+import * as providers from "../providers"
+
+const registrationFn = async (klass, container, pluginOptions) => {
+  container.register({
+    [`tp_${klass.identifier}`]: asFunction(
+      (cradle) => new klass(cradle, pluginOptions),
+      { lifetime: klass.LIFE_TIME || Lifetime.SINGLETON }
+    ),
+  })
+
+  container.registerAdd(
+    "tax_providers",
+    asFunction((cradle) => new klass(cradle, pluginOptions), {
+      lifetime: klass.LIFE_TIME || Lifetime.SINGLETON,
+    })
+  )
+}
+
+export default async ({
+  container,
+  options,
+}: LoaderOptions<
+  (
+    | ModulesSdkTypes.ModuleServiceInitializeOptions
+    | ModulesSdkTypes.ModuleServiceInitializeCustomDataLayerOptions
+  ) & { providers: ModuleProvider[] }
+>): Promise<void> => {
+  // Local providers
+  for (const provider of Object.values(providers)) {
+    await registrationFn(provider, container, {})
+  }
+
+  await moduleProviderLoader({
+    container,
+    providers: options?.providers || [],
+    registerServiceFn: registrationFn,
+  })
+}