chore(): Reorganize modules (#7210)

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

packages/modules/currency/src/models/currency.ts

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+import { BigNumberRawValue } from "@medusajs/types"
+import {
+  BigNumber,
+  MikroOrmBigNumberProperty,
+  Searchable,
+} from "@medusajs/utils"
+import { Entity, PrimaryKey, Property } from "@mikro-orm/core"
+
+@Entity({ tableName: "currency" })
+class Currency {
+  @Searchable()
+  @PrimaryKey({ columnType: "text" })
+  code!: string
+
+  @Property({ columnType: "text" })
+  symbol: string
+
+  @Property({ columnType: "text" })
+  symbol_native: string
+
+  @Searchable()
+  @Property({ columnType: "text" })
+  name: string
+
+  @Property({ columnType: "int", default: 0 })
+  decimal_digits: number
+
+  @MikroOrmBigNumberProperty({ default: 0 })
+  rounding: BigNumber | number
+
+  @Property({ columnType: "jsonb" })
+  raw_rounding: BigNumberRawValue
+
+  @Property({
+    onCreate: () => new Date(),
+    columnType: "timestamptz",
+    defaultRaw: "now()",
+  })
+  created_at: Date
+
+  @Property({
+    onCreate: () => new Date(),
+    onUpdate: () => new Date(),
+    columnType: "timestamptz",
+    defaultRaw: "now()",
+  })
+  updated_at: Date
+}
+
+export default Currency

packages/modules/currency/src/models/index.ts

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+export { default as Currency } from "./currency"