chore: import upstream snapshot with attribution

apps/sim/executor/execution/snapshot.ts

@@ -0,0 +1,51 @@
+import { normalizeStringArray } from '@/lib/core/utils/arrays'
+import { normalizeWorkflowVariables } from '@/lib/core/utils/records'
+import type { ExecutionMetadata, SerializableExecutionState } from '@/executor/execution/types'
+
+export class ExecutionSnapshot {
+  public readonly metadata: ExecutionMetadata
+  public readonly workflow: any
+  public readonly input: any
+  public readonly workflowVariables: Record<string, any>
+  public readonly selectedOutputs: string[]
+  public readonly state?: SerializableExecutionState
+
+  constructor(
+    metadata: ExecutionMetadata,
+    workflow: any,
+    input: any,
+    workflowVariables: unknown,
+    selectedOutputs: unknown = [],
+    state?: SerializableExecutionState
+  ) {
+    this.metadata = metadata
+    this.workflow = workflow
+    this.input = input
+    this.workflowVariables = normalizeWorkflowVariables(workflowVariables)
+    this.selectedOutputs = normalizeStringArray(selectedOutputs)
+    this.state = state
+  }
+
+  toJSON(): string {
+    return JSON.stringify({
+      metadata: this.metadata,
+      workflow: this.workflow,
+      input: this.input,
+      workflowVariables: this.workflowVariables,
+      selectedOutputs: this.selectedOutputs,
+      state: this.state,
+    })
+  }
+
+  static fromJSON(json: string): ExecutionSnapshot {
+    const data = JSON.parse(json)
+    return new ExecutionSnapshot(
+      data.metadata,
+      data.workflow,
+      data.input,
+      data.workflowVariables,
+      data.selectedOutputs,
+      data.state
+    )
+  }
+}