fix(types): Include TypeScript types with module

[csidell-earny]

Fixes #526

• [ X ] Tests and linter pass
• [ X ] Code coverage does not decrease (if any source code was changed)
• [ X ] Appropriate docs were updated (if necessary)

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[csidell-earny]

@googlebot I signed it!

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[JustinBeckwith]

Thanks for the PR! That flag is set upstream in gts, so we are emitting a d.ts file. What we aren't doing, is including the d.ts in the final npm package. To do that, we need to link to the types file in package.json. Here's an example:
https://github.com/googleapis/nodejs-storage/blob/master/package.json#L12

Mind taking a look at making that change?

[csidell-earny]

@JustinBeckwith I wouldn't know what it is upstream, I assume it's the same filename?

[JustinBeckwith]

It should look exactly like the line I pointed to above :)

[csidell-earny]

Well in that case that change has been made!

[csidell-earny]

Should be ready to merge, undid the type fixes for some of the exists() calls as to not have this do more than the original PR title. @JustinBeckwith

[codecov]

Codecov Report

Merging #527 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #527   +/-   ##
=======================================
  Coverage   97.79%   97.79%           
=======================================
  Files          10       10           
  Lines        1313     1313           
  Branches      347      347           
=======================================
  Hits         1284     1284           
  Partials       29       29

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