feat(ec2): add high memory instances u-6tb1, u-9tb1, u-12tb1, u-18tb1, and u-24tb1 (#17964)

`u-6tb1`,`u-9tb1`, `u-12tb1` blog post:
https://aws.amazon.com/blogs/aws/now-available-amazon-ec2-high-memory-instances-with-6-9-and-12-tb-of-memory-perfect-for-sap-hana/

`u-18tb1` `u-24tb1` blog post:
https://aws.amazon.com/blogs/aws/ec2-high-memory-update-new-18-tb-and-24-tb-instances/

----

*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/aws-ec2/lib/instance-types.ts

@@ -183,6 +183,56 @@ export enum InstanceClass {
    */
   MEMORY5_AMD_NVME_DRIVE = 'r5ad',
 
+  /**
+   * High memory instances (6TB) based on Intel Xeon Platinum 8176M (Skylake) processors, 1st generation
+   */
+  HIGH_MEMORY_6TB_1 = 'u-6tb1',
+
+  /**
+   * High memory instances (6TB) based on Intel Xeon Platinum 8176M (Skylake) processors, 1st generation
+   */
+  U_6TB1 = 'u-6tb1',
+
+  /**
+   * High memory instances (9TB) based on Intel Xeon Platinum 8176M (Skylake) processors, 1st generation
+   */
+  HIGH_MEMORY_9TB_1 = 'u-9tb1',
+
+  /**
+   * High memory instances (9TB) based on Intel Xeon Platinum 8176M (Skylake) processors, 1st generation
+   */
+  U_9TB1 = 'u-9tb1',
+
+  /**
+   * High memory instances (12TB) based on Intel Xeon Platinum 8176M (Skylake) processors, 1st generation
+   */
+  HIGH_MEMORY_12TB_1 = 'u-12tb1',
+
+  /**
+   * High memory instances (12TB) based on Intel Xeon Platinum 8176M (Skylake) processors, 1st generation
+   */
+  U_12TB1 = 'u-12tb1',
+
+  /**
+   * High memory instances (18TB) based on Intel Xeon Scalable (Cascade Lake) processors, 1st generation
+   */
+  HIGH_MEMORY_18TB_1 = 'u-18tb1',
+
+  /**
+   * High memory instances (18TB) based on Intel Xeon Scalable (Cascade Lake) processors, 1st generation
+   */
+  U_18TB1 = 'u-18tb1',
+
+  /**
+   * High memory instances (24TB) based on Intel Xeon Scalable (Cascade Lake) processors, 1st generation
+   */
+  HIGH_MEMORY_24TB_1 = 'u-24tb1',
+
+  /**
+   * High memory instances (24TB) based on Intel Xeon Scalable (Cascade Lake) processors, 1st generation
+   */
+  U_24TB1 = 'u-24tb1',
+
   /**
    * Memory optimized instances based on AMD EPYC with local NVME drive, 5th generation
    */
@@ -741,6 +791,16 @@ export enum InstanceSize {
    */
   XLARGE48 = '48xlarge',
 
+  /**
+   * Instance size XLARGE56 (56xlarge)
+   */
+  XLARGE56 = '56xlarge',
+
+  /**
+   * Instance size XLARGE56 (112xlarge)
+   */
+  XLARGE112 = '112xlarge',
+
   /**
    * Instance size METAL (metal)
    */