Add a lib folder and some extra constructs to generated project

[ankitmahapatra22]

Description of the feature or enhancement:

I found the new WebService construct documented in https://github.com/awslabs/cdk8s/blob/master/docs/getting-started/typescript.md very useful and I think it should be created by default in the generated project within the lib folder. Custom constructs for databases like Redis, Postgres can be added to the lib folder.

Use Case:

Higher abstraction. Reduced copy paste efforts and more API kind experience for the developer. For bulk of the cases , default ports would be used anyways. If the user wants any more customization , they can either modify the construct or extend it to add features.

Proposed Solution:

Other:

Update the documentation showcasing how to use shipped extended constructs.

• [ ] :wave: I may be able to implement this feature request
• [ ] :warning: This feature might incur a breaking change

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This is a :rocket: Feature Request

[eladb]

We prefer not to bloat our project templates. The recommended way to vend abstractions in the cdk8s is to publish construct libraries such as cdk8s-debore, cdk8s-redis and more.