refactor(benchpress): added tsconfig and fixed ts errors

[wagnermaciel]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/angular/angular/blob/master/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Documentation content changes
• angular.io application / infrastructure changes
• Other... Please describe:

What is the current behavior?

modules/benchmarks was not getting ts checked properly.

What is the new behavior?

modules/benchmarks has it's own tsconfig now, which should help alleviate some of the divergence between internal and external benchpress tests.

Does this PR introduce a breaking change?

• Yes
• No

[wagnermaciel]

Side note

It would be nice to reduce or even eliminate our usage of @types/jasminewd2 from our repo since it is severely outdated -- it's last publish was 2 years ago. See https://www.npmjs.com/package/jasminewd2

[jelbourn]

LGTM

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