Add @opencensus/web-instrumentation-zone-peer-dep

[crdgonzalezca]

Add this new package allow customers to choose a package with Zone.js as hard dependy or as peer dependency. This allows to applications in frameworks like React to avoid adding that dependency, also, for apps already depending on Zone.js this is not added, that is the case for Angular apps.

[draffensperger]

What happened with the Zone.js type that was missing from their .d.ts file? How did that get resolved?

[crdgonzalezca]

What happened with the Zone.js type that was missing from their .d.ts file? How did that get resolved?

This PR does not update the Zone.js library to the last version and the problem is related to that version. I am planning on doing this for a different PR as I consider this is big enough.

[codecov-io]

Codecov Report

Merging #147 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master    #147   +/-   ##
======================================
  Coverage    95.9%   95.9%           
======================================
  Files          30      30           
  Lines         855     855           
  Branches      148     148           
======================================
  Hits          820     820           
  Misses         35      35

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