feat: Adds Stream Instance L1 CDK construct

[oarbusi]

Proposed changes

Adds Stream Instance L1 CDK construct

Link to any related issue(s): https://jira.mongodb.org/browse/CLOUDP-230534

Manual QA done with example file

CREATE

cdk deploy

✅  CdkTestStack

✨  Deployment time: 18.99s

Stack ARN:
arn:aws:cloudformation:eu-west-1:358363220050:stack/CdkTestStack/2d47c460-dd34-11ee-a39c-02d56f5cea7f

✨  Total time: 20.88s

DELETE

cdk destroy 

Are you sure you want to delete: CdkTestStack (y/n)? y
CdkTestStack: destroying... [1/1]

 ✅  CdkTestStack: destroyed

Type of change:

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change requires a documentation update

Required Checklist:

• [x] I have signed the MongoDB CLA
• [x] I have added tests that prove my fix is effective or that my feature works
• [x] I have added any necessary documentation (if appropriate)
• [x] I have run make fmt and formatted my code
• [x] I have tested the CDK constructor in a CFN stack. See TESTING.md
• [x] If changes include removal or addition of 3rd party GitHub actions, I updated our internal document. Reach out to the APIx Integration slack channel to get access to the internal document.

Further comments