[Client] Create hooks to fetch data for bundle analysis summary

[nicholas-codecov]

We need to fetch some basic information to generate the dropdown summary string. We can grab the missesCount and partialsCount fields from the patchTotals object on the Comparison type in GraphQL. From this hook we will want to return the sum of the two values or return 0 if there is no missing lines.

Designs can be found here.

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Tasks

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1. Create hook to fetch bundle analysis summary data for a given commit
2. Create hook to fetch bundle analysis summary data for a given PR

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Blocked by

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1. [API] Provide a total size and load time change for all bundles in a commit/pull #960
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2. [API] Return simluated load speed for bundle size over a “3g” network #959
   +0