feat(ec2): Support for new EBS types (aws#12074)

closes aws#12071

Added new EBS types released in re:Invent 2020 and fixed some documentation problems.  Some observations:

./packages/@aws-cdk/aws-elasticsearch/lib/domain.ts - The Elasticsearch service allows only General Purpose, Provisioned IOPS and Magnetic. 
./packages/@aws-cdk/aws-rds/lib/instance.ts - Storage types and the official link were added

For compatibility reasons, I kept the " GENERAL_PURPOSE_SSD" as GP2 and created a new type called "GENERAL_PURPOSE_SSD_GP3" for GP3. The same happened to IO1/IO2. Please let me know if it is correct, I think it is the best way to not break stacks that already exist with these definitions.

@NetaNir 
----

*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-autoscaling/lib/volume.ts

@@ -178,15 +178,25 @@ export enum EbsDeviceVolumeType {
   STANDARD = 'standard',
 
   /**
-   *  Provisioned IOPS SSD
+   *  Provisioned IOPS SSD - IO1
    */
   IO1 = 'io1',
 
   /**
-   * General Purpose SSD
+   *  Provisioned IOPS SSD - IO2
+   */
+  IO2 = 'io2',
+
+  /**
+   * General Purpose SSD - GP2
    */
   GP2 = 'gp2',
 
+  /**
+   * General Purpose SSD - GP3
+   */
+  GP3 = 'gp3',
+
   /**
    * Throughput Optimized HDD
    */

packages/@aws-cdk/aws-ec2/lib/volume.ts

@@ -205,15 +205,25 @@ export enum EbsDeviceVolumeType {
   STANDARD = 'standard',
 
   /**
-   *  Provisioned IOPS SSD
+   *  Provisioned IOPS SSD - IO1
    */
   IO1 = 'io1',
 
   /**
-   * General Purpose SSD
+   *  Provisioned IOPS SSD - IO2
+   */
+  IO2 = 'io2',
+
+  /**
+   * General Purpose SSD - GP2
    */
   GP2 = 'gp2',
 
+  /**
+   * General Purpose SSD - GP3
+   */
+  GP3 = 'gp3',
+
   /**
    * Throughput Optimized HDD
    */
@@ -225,15 +235,25 @@ export enum EbsDeviceVolumeType {
   SC1 = 'sc1',
 
   /**
-   * General purpose SSD volume that balances price and performance for a wide variety of workloads.
+   * General purpose SSD volume (GP2) that balances price and performance for a wide variety of workloads.
    */
   GENERAL_PURPOSE_SSD = GP2,
 
   /**
-   * Highest-performance SSD volume for mission-critical low-latency or high-throughput workloads.
+   * General purpose SSD volume (GP3) that balances price and performance for a wide variety of workloads.
+   */
+  GENERAL_PURPOSE_SSD_GP3 = GP3,
+
+  /**
+   * Highest-performance SSD volume (IO1) for mission-critical low-latency or high-throughput workloads.
    */
   PROVISIONED_IOPS_SSD = IO1,
 
+  /**
+   * Highest-performance SSD volume (IO2) for mission-critical low-latency or high-throughput workloads.
+   */
+  PROVISIONED_IOPS_SSD_IO2 = IO2,
+
   /**
    * Low-cost HDD volume designed for frequently accessed, throughput-intensive workloads.
    */

packages/@aws-cdk/aws-elasticsearch/lib/domain.ts

@@ -210,7 +210,7 @@ export interface EbsOptions {
   readonly volumeSize?: number;
 
   /**
-   * The EBS volume type to use with the Amazon ES domain, such as standard, gp2, io1, st1, or sc1.
+   * The EBS volume type to use with the Amazon ES domain, such as standard, gp2, io1.
    * For more information, see[Configuring EBS-based Storage]
    * (https://docs.aws.amazon.com/elasticsearch-service/latest/developerguide/es-createupdatedomains.html#es-createdomain-configure-ebs)
    * in the Amazon Elasticsearch Service Developer Guide.

packages/@aws-cdk/aws-rds/lib/instance.ts

@@ -283,7 +283,9 @@ export interface DatabaseInstanceNewProps {
   readonly availabilityZone?: string;
 
   /**
-   * The storage type.
+   * The storage type. Storage types supported are gp2, io1, standard.
+   *
+   * @see https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/CHAP_Storage.html#Concepts.Storage.GeneralSSD
    *
    * @default GP2
    */