feat(ivs): support RTMP ingest for IVS channel (#31380)

### Issue # (if applicable)
N/A

### Reason for this change
Add missing property.

### Description of changes
Add `insecureIngest`property.



### Description of how you validated changes
Add unit tests and integ 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*

packages/@aws-cdk/aws-ivs-alpha/README.md

@@ -55,6 +55,17 @@ const myChannel = new ivs.Channel(this, 'myChannel', {
 });
 ```
 
+If you want to use RTMP ingest, set `insecureIngest` property to `true`.
+By default, `insecureIngest` is `false` which means using RTMPS ingest.
+
+**⚠ Note:** RTMP ingest might result in reduced security for your streams. AWS recommends that you use RTMPS for ingest, unless you have specific and verified use cases. For more information, see [Encoder Settings](https://docs.aws.amazon.com/ivs/latest/LowLatencyUserGuide/streaming-config.html#streaming-config-settings).
+
+```ts
+const myRtmpChannel = new ivs.Channel(this, 'myRtmpChannel', {
+  type: ivs.ChannelType.STANDARD,
+  insecureIngest: true, // default value is false
+});
+```
 
 ### Importing an existing channel
 

packages/@aws-cdk/aws-ivs-alpha/lib/channel.ts

@@ -117,6 +117,13 @@ export interface ChannelProps {
    */
   readonly authorized?: boolean;
 
+  /**
+   * Whether the channel allows insecure RTMP ingest.
+   *
+   * @default false
+   */
+  readonly insecureIngest?: boolean;
+
   /**
    * Channel latency mode.
    *
@@ -211,6 +218,7 @@ export class Channel extends ChannelBase {
 
     const resource = new CfnChannel(this, 'Resource', {
       authorized: props.authorized,
+      insecureIngest: props.insecureIngest,
       latencyMode: props.latencyMode,
       name: this.physicalName,
       type: props.type,

packages/@aws-cdk/aws-ivs-alpha/test/integ.ivs-insecure-ingest.js.snapshot/aws-cdk-ivs-insecure-ingest.template.json

@@ -0,0 +1,46 @@
+{
+ "Resources": {
+  "ChannelInsecureIngestEnabled1E9B93E0": {
+   "Type": "AWS::IVS::Channel",
+   "Properties": {
+    "InsecureIngest": true,
+    "Name": "aws-cdk-ivs-insecure-ingestChannelInsecureIngestEnabled15F31314",
+    "Type": "STANDARD"
+   }
+  }
+ },
+ "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."
+    }
+   ]
+  }
+ }
+}