chore(ec2): add inf2 instance type (#25249)

https://aws.amazon.com/blogs/aws/amazon-ec2-inf2-instances-for-low-cost-high-performance-generative-ai-inference-are-now-generally-available/

Spiritual successor of #23160

----

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

Author: robertd

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

@@ -884,6 +884,16 @@ export enum InstanceClass {
    */
   INF1 = 'inf1',
 
+  /**
+   * Inferentia Chips based instances for machine learning inference applications, 2nd generation
+   */
+  INFERENCE2 = 'inference2',
+
+  /**
+   * Inferentia Chips based instances for machine learning inference applications, 2nd generation
+   */
+  INF2 = 'inf2',
+  
   /**
    * Macintosh instances built on Apple Mac mini computers, 1st generation with Intel procesors
    */
@@ -1237,6 +1247,8 @@ export class InstanceType {
       [InstanceClass.Z1D]: 'z1d',
       [InstanceClass.INFERENCE1]: 'inf1',
       [InstanceClass.INF1]: 'inf1',
+      [InstanceClass.INFERENCE2]: 'inf2',
+      [InstanceClass.INF2]: 'inf2',
       [InstanceClass.MACINTOSH1_INTEL]: 'mac1',
       [InstanceClass.MAC1]: 'mac1',
       [InstanceClass.VIDEO_TRANSCODING1]: 'vt1',