feat(stepfunctions): add support for Jsonata expressions to Map.ItemSelector (#34625)

### Issue 

Closes #34538.

### Reason for this change

In the current implementation `itemSelector` must be an object type `Mapping[str, Any]`, but Step Functions supports both object mappings and JSONata expressions as strings. 

See the [Amazon States Language](https://states-language.net/spec.html#map-state) specification:

> A JSONata Map State MAY have an "ItemSelector" field, whose value MUST be a JSON text, or a JSONata string that evaluates to a JSON text.

### Description of changes


This PR adds a new field `jsonataItemSelector` of type `string` to support this use case. This new field is mutually exclusive with `itemSelector` (and `parameters` as it is already mutually exclusive with `itemSelector` and deprecated).

During synthesis, if `jsonataItemSelector` is used, then it will be used to render the `ItemSelector` in the cloudformation template.


I considered creating a class like the [ProvideItems](https://github.com/aws/aws-cdk/blob/ed08f3f0b8ecd79a2fa5e804acc73a9ff23eab80/packages/aws-cdk-lib/aws-stepfunctions/lib/states/map-base.ts#L60-L77) class, however this would have been a breaking change for existing users.

### Describe any new or updated permissions being added

None.


### Description of how you validated changes

Added unit tests and an integration test.

### Checklist
- [x] My code adheres to the [CONTRIBUTING GUIDE](https://github.com/aws/aws-cdk/blob/main/CONTRIBUTING.md) and [DESIGN GUIDELINES](https://github.com/aws/aws-cdk/blob/main/docs/DESIGN_GUIDELINES.md)

----

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

Author: leonmk-aws

packages/@aws-cdk-testing/framework-integ/test/aws-stepfunctions/test/integ.map-jsonata-itemselector.js.snapshot/asset.97484721f29e34bf38d7a459804dd2d2a8dea6f8c27d7531e215bf4274fbc895.bundle/index.js

@@ -0,0 +1,82 @@
+{
+ "Resources": {
+  "StateMachineRoleB840431D": {
+   "Type": "AWS::IAM::Role",
+   "Properties": {
+    "AssumeRolePolicyDocument": {
+     "Statement": [
+      {
+       "Action": "sts:AssumeRole",
+       "Effect": "Allow",
+       "Principal": {
+        "Service": "states.amazonaws.com"
+       }
+      }
+     ],
+     "Version": "2012-10-17"
+    }
+   }
+  },
+  "StateMachine2E01A3A5": {
+   "Type": "AWS::StepFunctions::StateMachine",
+   "Properties": {
+    "DefinitionString": "{\"StartAt\":\"My-Map-State\",\"States\":{\"My-Map-State\":{\"Type\":\"Map\",\"QueryLanguage\":\"JSONata\",\"End\":true,\"ItemSelector\":\"{% {\\\"foo\\\": \\\"foo\\\", \\\"bar\\\": $states.input.bar} %}\",\"ItemProcessor\":{\"ProcessorConfig\":{\"Mode\":\"INLINE\"},\"StartAt\":\"Pass State\",\"States\":{\"Pass State\":{\"Type\":\"Pass\",\"End\":true}}},\"MaxConcurrency\":1}},\"TimeoutSeconds\":30}",
+    "RoleArn": {
+     "Fn::GetAtt": [
+      "StateMachineRoleB840431D",
+      "Arn"
+     ]
+    }
+   },
+   "DependsOn": [
+    "StateMachineRoleB840431D"
+   ],
+   "UpdateReplacePolicy": "Delete",
+   "DeletionPolicy": "Delete"
+  }
+ },
+ "Outputs": {
+  "ExportsOutputRefStateMachine2E01A3A5BA46F753": {
+   "Value": {
+    "Ref": "StateMachine2E01A3A5"
+   },
+   "Export": {
+    "Name": "cdk-stepfunctions-map-jsonata-itemselector-stack:ExportsOutputRefStateMachine2E01A3A5BA46F753"
+   }
+  }
+ },
+ "Parameters": {
+  "BootstrapVersion": {
+   "Type": "AWS::SSM::Parameter::Value<String>",
+   "Default": "/cdk-bootstrap/hnb659fds/version",
+   "Description": "Version of the CDK Bootstrap resources in this environment, automatically retrieved from SSM Parameter Store. [cdk:skip]"
+  }
+ },
+ "Rules": {
+  "CheckBootstrapVersion": {
+   "Assertions": [
+    {
+     "Assert": {
+      "Fn::Not": [
+       {
+        "Fn::Contains": [
+         [
+          "1",
+          "2",
+          "3",
+          "4",
+          "5"
+         ],
+         {
+          "Ref": "BootstrapVersion"
+         }
+        ]
+       }
+      ]
+     },
+     "AssertDescription": "CDK bootstrap stack version 6 required. Please run 'cdk bootstrap' with a recent version of the CDK CLI."
+    }
+   ]
+  }
+ }
+}