feat(rds): Adds support for DB2 instance creation

[cedricmillet]

The purpose of this issue is to update DatabaseInstance (+ DatabaseInstanceEngine and related classes/interfaces) and add support for RDS with DB2.

Currently 2 versions are handled :
db2-se-11-5 = DB2 Standard Edition v11.5
db2-ae-11.5 = DB2 Advanced Edition v11.5

Closes #28485.

AWS RDS for DB2 official home page

From now, you can create a new RDS for DB2 instance with DatabaseInstance constructor as follow

  // Create a param group intended to store IBM DB2 license
  const pGroup = new ParameterGroup(stack, `MyParamGroup`, {
    engine: DatabaseInstanceEngine.db2Se({ version: Db2EngineVersion.VER_11_5 }),
  })
  pGroup.addParameter("rds.ibm_customer_id", "XXXXXXXXX");
  pGroup.addParameter("rds.ibm_site_id", "XXXXXXXXXXX");
  
  // force cloud formation param group generation:
  // https://github.com/aws/aws-cdk/issues/9741
  pGroup.bindToInstance({}); 

  new DatabaseInstance(stack, `MyDBInstance`, {
    vpc,
    engine: DatabaseInstanceEngine.db2Se({version: Db2EngineVersion.VER_11_5}),
    instanceType: InstanceType.of(InstanceClass.M6I, InstanceSize.LARGE), // Minimal instance class for DB2
    securityGroups: [securityGroup],
    vpcSubnets: { subnetType: SubnetType.PRIVATE_ISOLATED },
    port: 50000,
    databaseName: dbName,
    licenseModel: LicenseModel.BRING_YOUR_OWN_LICENSE,
    parameterGroup: pGroup,
    // + username, storage, storageEncrypted...
  });

---

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

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AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 79d9351
• Result: FAILED
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[laurelmay]

Thanks for your work on this! There are a few things that will be helpful to get started with a meaningful review:

1. Integration tests will be important to ensure that the code here actual creates a working CloudFormation template. https://github.com/aws/aws-cdk/blob/main/INTEGRATION_TESTS.md has some information and you may find other integration tests in packages/@aws-cdk-testing/framework-integ/test/aws-rds/test to be helpful in seeing how these tests are done for other RDS instance types.
2. The build needs to be passing. It looks like the primary failure at the moment is because the PR happened to be opened while the build was in a bad state due to date changing at the new year; updating your branch from main should help resolve that failure to see if there are any other issues with the build.

[aws-cdk-automation]

This PR has been in the CHANGES REQUESTED state for 3 weeks, and looks abandoned. To keep this PR from being closed, please continue work on it. If not, it will automatically be closed in a week.

[aws-cdk-automation]

This PR has been deemed to be abandoned, and will be automatically closed. Please create a new PR for these changes if you think this decision has been made in error.

[aws-cdk-automation]

The pull request linter fails with the following errors:

❌ Features must contain a change to a README file.
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