feat: Create shipping options workflow (#6962)

**What**

- Create main workflow
- Update create pricing rule types step to be idempotent
- update remote joiner to support granular isList confguration on field aliases
- Add full workflow integration tests

packages/core-flows/src/pricing/steps/create-pricing-rule-types.ts

@@ -1,16 +1,32 @@
 import { ModuleRegistrationName } from "@medusajs/modules-sdk"
 import { CreateRuleTypeDTO, IPricingModuleService } from "@medusajs/types"
-import { StepResponse, createStep } from "@medusajs/workflows-sdk"
+import { createStep, StepResponse } from "@medusajs/workflows-sdk"
 
 export const createPricingRuleTypesStepId = "create-pricing-rule-types"
 export const createPricingRuleTypesStep = createStep(
   createPricingRuleTypesStepId,
   async (data: CreateRuleTypeDTO[], { container }) => {
+    if (!data?.length) {
+      return
+    }
+
     const pricingModule = container.resolve<IPricingModuleService>(
       ModuleRegistrationName.PRICING
     )
 
-    const ruleTypes = await pricingModule.createRuleTypes(data)
+    const existingRuleTypes = await pricingModule.listRuleTypes({
+      rule_attribute: data.map((d) => d.rule_attribute),
+    })
+
+    const existingRuleTypeAttributes = new Set(
+      existingRuleTypes.map((ruleType) => ruleType.rule_attribute)
+    )
+
+    const ruleTypesToCreate = data.filter(
+      (dataItem) => !existingRuleTypeAttributes.has(dataItem.rule_attribute)
+    )
+
+    const ruleTypes = await pricingModule.createRuleTypes(ruleTypesToCreate)
 
     return new StepResponse(
       ruleTypes,