Create CDK deployment constructs and a basic demo stack for self-hosted Restate on AWS

[pcholakov]

As part of our positioning for Restate within the AWS Serverless community, we want native-feeling CDK support for deploying Restate services. Additionally, we can provide an easy ramp for deploying self-hosted Restate on AWS using the same mechanism. This issue tracks the minimal requirements for a Restate CDK construct library that supports the following:

• Easily deploy Restate to AWS in a native, low-cost way that is suitable for dev/test and evaluation purposes; it should provide reasonable durability but no effort is made to ensure high availability
• Makes a basic effort to assist customers with operating the Restate infrastructure (e.g. sets up instance OS patching out of the box)
• Supports deploying AWS Lambda-based Restate services as easily as managing any other Lambda function in CDK
• The initial version will only support TypeScript

Tasks

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1. Create a basic EC2/VPC deployment for Restate
2. Send Restate logs to CloudWatch Logs
3. Create CDK Construct to deploy Restate on an EC2 instance
4. Create CDK Construct to deploy Lambda-based Restate services
5. Migrate to native Lambda invoke mechanism #3
   +0
6. Secure access to the Restate ingress endpoint #2
   +0
   
7. Ensure discovery is called on EC2 configuration changes (e.g. IP address); alternatively, enable termination protection restate-cdk-support#4
   +0
8. Implement deregistration of services from Restate #5
   2 of 3
   +0
9. Document the local dev experience story
10. Set up EC2 SSM patching schedule restate-cdk-support#9
    +0
11. Cost optimization: find a way to drop the NAT Gateway #8
    +0
12. Mount a dedicated EBS volume for persistent data so that Restate state can be retained and moved around #7
    +0
13. Write announcement blog post for CDK/self-hosted Restate how-to

[pcholakov]

I'm going to close this top-level issue; we have enough to update https://github.com/restatedev/restate-holiday/issues/ to use the new constructs - and I have converted all the remaining open sub-tasks to their own issues.