chore(): Reorganize modules (#7210)

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

packages/modules/workflow-engine-inmemory/src/models/index.ts

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+export { default as WorkflowExecution } from "./workflow-execution"

packages/modules/workflow-engine-inmemory/src/models/workflow-execution.ts

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+import { TransactionState } from "@medusajs/orchestration"
+import { DALUtils, generateEntityId } from "@medusajs/utils"
+import {
+  BeforeCreate,
+  Entity,
+  Enum,
+  Filter,
+  Index,
+  OnInit,
+  OptionalProps,
+  PrimaryKey,
+  Property,
+  Unique,
+} from "@mikro-orm/core"
+
+type OptionalFields = "deleted_at"
+
+@Entity()
+@Unique({
+  name: "IDX_workflow_execution_workflow_id_transaction_id_unique",
+  properties: ["workflow_id", "transaction_id"],
+})
+@Filter(DALUtils.mikroOrmSoftDeletableFilterOptions)
+export default class WorkflowExecution {
+  [OptionalProps]?: OptionalFields
+
+  @Property({ columnType: "text", nullable: false })
+  @Index({ name: "IDX_workflow_execution_id" })
+  id!: string
+
+  @Index({ name: "IDX_workflow_execution_workflow_id" })
+  @PrimaryKey({ columnType: "text" })
+  workflow_id: string
+
+  @Index({ name: "IDX_workflow_execution_transaction_id" })
+  @PrimaryKey({ columnType: "text" })
+  transaction_id: string
+
+  @Property({ columnType: "jsonb", nullable: true })
+  execution: Record<string, unknown> | null = null
+
+  @Property({ columnType: "jsonb", nullable: true })
+  context: Record<string, unknown> | null = null
+
+  @Index({ name: "IDX_workflow_execution_state" })
+  @Enum(() => TransactionState)
+  state: TransactionState
+
+  @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
+
+  @Property({ columnType: "timestamptz", nullable: true })
+  deleted_at: Date | null = null
+
+  @BeforeCreate()
+  onCreate() {
+    this.id = generateEntityId(this.id, "wf_exec")
+  }
+
+  @OnInit()
+  onInit() {
+    this.id = generateEntityId(this.id, "wf_exec")
+  }
+}