chore(ec2): trn1n instance type (#28914)

adding support of trn1n instance type

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

Author: ayush-shah-1501

packages/aws-cdk-lib/aws-ec2/lib/instance-types.ts

@@ -616,6 +616,11 @@ export enum InstanceClass {
    */
   TRN1 = 'trn1',
 
+  /**
+   * High performance computing powered by AWS Trainium
+   */
+  TRN1N = 'trn1n',
+
   /**
    * Storage/compute balanced instances, 1st generation
    */
@@ -1401,6 +1406,7 @@ export class InstanceType {
       [InstanceClass.STORAGE3_ENHANCED_NETWORK]: 'd3en',
       [InstanceClass.D3EN]: 'd3en',
       [InstanceClass.TRN1]: 'trn1',
+      [InstanceClass.TRN1N]: 'trn1n',
       [InstanceClass.STORAGE_COMPUTE_1]: 'h1',
       [InstanceClass.H1]: 'h1',
       [InstanceClass.IO3]: 'i3',