feat(ec2): add mac1 instance (#17677)

`mac1` instances got released last year:
https://aws.amazon.com/about-aws/whats-new/2021/10/amazon-ec2-mac-instances-additional-regions/

Docs have already been updated a while ago:
https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-ec2-instance.html#cfn-ec2-instance-instancetype

Note: Whenever `mac2` comes out (probably on M1, or most likely on M1Pro/M1Max) we'll have to update `InstanceArchitecture` enum [here](https://github.com/aws/aws-cdk/blob/ddf2881ee24cbf3083463a6e772a5c91acc229aa/packages/%40aws-cdk/aws-ec2/lib/instance-types.ts#L573).

----

*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

@@ -574,7 +574,17 @@ export enum InstanceClass {
   /**
    * Inferentia Chips based instances for machine learning inference applications, 1st generation
    */
-  INF1 = 'inf1'
+  INF1 = 'inf1',
+
+  /**
+   * Macintosh instances built on Apple Mac mini computers, 1st generation with Intel procesors
+   */
+  MACINTOSH1_INTEL = 'mac1',
+
+  /**
+   * Macintosh instances built on Apple Mac mini computers, 1st generation with Intel procesors
+   */
+  MAC1 = 'mac1',
 }
 
 /**
@@ -695,7 +705,6 @@ export enum InstanceSize {
    * Instance size METAL (metal)
    */
   METAL = 'metal',
-
 }
 
 /**

packages/@aws-cdk/aws-ec2/test/instance.test.ts

@@ -483,4 +483,4 @@ test('cause replacement from s3 asset in userdata', () => {
       [`InstanceTwoDC29A7A7${hash}`]: expect.objectContaining({ Type: 'AWS::EC2::Instance', Properties: expect.anything() }),
     }),
   }));
-});
+});