tslint: add rule "no-angle-bracket-type-assertion"

[carlo-nomes]

I'm submitting a...

[ ] Regression (a behavior that used to work and stopped working in a new release)
[ ] Bug report  
[X] Feature request
[ ] Documentation issue or request
[ ] Support request => Please do not submit support request here, instead see https://github.com/NationalBankBelgium/stark/blob/master/CONTRIBUTING.md#got-a-question-or-problem

Current behavior

For now there is no specific ts-lint rule for type assertion.
This means both of these are valid:

• const circle: Circle = shape as Circle
• const circle: Circle = <Circle> shape;

Expected behavior

To increase consistency the rule "no-angle-bracket-type-assertion" should be enabled in /packages/stark-build/config/tslint.json to enforce the first way of type assertion.
Or the other option can be chosen, but there no is rule available yet. (palantir/tslint#1228)

It is a choice between the two ways, but using as has a slight preference. (Because of compatibility with JSX).
TypeScript documentation
TSLint documentation

Minimal reproduction of the problem with instructions

const circle: Circle = shape as Circle; // Passes
const circle: Circle = <Circle> shape; // Passes

What is the motivation / use case for changing the behavior?

Increasing consistency in the source code.

Environment

Angular CLI: 7.1.4
Node: 11.4.0
OS: darwin x64
Angular: 7.1.1

For Tooling issues:
- Node version: v11.4.0  
- Platform:  All

Others:
- TSLint: 5.11.0
- TypeScript: Version 3.2.2

[carlo-nomes]

There does exist an extension that supports type assertion. ajaff/tslint-consistent-codestyle

[christophercr]

There is also another tslint extension from Microsoft: https://github.com/Microsoft/tslint-microsoft-contrib

In there, the rule is: prefer-type-cast