feat(init-templates): add typesRoot compiler option for typescript templates in the tsconfig.json

[carlosrfernandez]

Closes #3830

Given a project structure where the cdk (init) generated node_modules has a parent node project with its own node_modules folder with failing typescript code, the CDK will not compile because tsc traverses the directory structure looking for type definitions.

This small change adds the typesRoot compiler option essentially rooting the typescript compiler to look for types under the cdk_root_folder/node_modules/@types.

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[mergify]

Pull Request Checklist

• Testing

• Unit test added (prefer to add a new test rather than modify existing tests)
• CLI change? Re-run/add CLI integration tests

• Documentation

• Inline docs: make sure all public APIs are documented (copy & paste from official AWS docs)
• README: update module README
• Design: for significant features, follow the design process

• Title uses the format type(scope): text

• Type: fix, feat, refactor go into CHANGELOG, chore is hidden
• Scope: name of the module without the aws- or cdk- prefix or postfix (e.g. s3 instead of aws-s3-deployment)
• Style: use all lower-case, do not end with a period

• Description

• Rationale: describe rationale of change and approach taken
• Issues: Indicate issues fixed via: fixes #xxx or closes #xxx
• Breaking?: last paragraph: BREAKING CHANGE: <describe what changed + link for details>

• Sensitive Modules (requires 2 PR approvers)

• IAM document library (in @aws-cdk/aws-iam)
• EC2 security groups and ACLs (in @aws-cdk/aws-ec2)
• Grant APIs (if not based on official documentation with a reference)

[eladb]

@RomainMuller can you chime in? What do you think?

[RomainMuller]

That sounds fair - the only question is can this have unintended consequences?

[carlosrfernandez]

To be honest, I can’t really say if this will have additional side effects.

But depending how you look at it, without having this setting, the side effects are already happening.

It’s a valid concern though...

[rix0rrr]

Let's give it a shot.

[mergify]

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