fix(init-templates): remove dependency on @types/node

[RomainMuller]

That was not required anymore since we no longer require passing the
command line arguments to the app.run() call. This dependency has the
potential of causing collisions with the ES libraries included by the
TypeScript compiler, and specifying a correct version can be a delicate
exercise, especially as those templates have to keep working in the
future.

Additionally, pinned the TypeScript compiler version to the current
minor, as recommended by the TypeScript maintainers (TypeScript does not
honor SemVer, but guarantees no breaking change between stable releases,
which they indicate by issuing a new major version).

Fixes #3839

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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)

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