feat(@schematics/angular): activate recommended tslint rules

[cexbrayat]

PR #13213 made tslint.json extend tslint:recommended.
As a first step, we deactivated explicitely all rules that were in the recommended set but were not in the old tslint.json file to keep the exact same configuration.

This PR activates a few of the recommended rules that were explicitely deactiviated, making te confoguration closer to the recommended one, and shorter. I tried to keep the "Angular style guide" and chose to activate the ones that I think are not controversial. Let me know what you think.

cc @mgechev

[clydin]

Looks good except for two rules.

[cexbrayat]

@clydin Thanks for the review. For now, I deactivated max-classes-per-file per your feedback and amended the the PR, and I'll remove no-var-require if necessary after my answer on your comment.

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