[w3ctag/design-reviews] Add simpler reading methods to Blob interface. (#363)

Góðan dag TAG！

I'm requesting a TAG review of:

  - Name: Simpler reading methods for Blob interface
  - Explainer, Requirements Doc, or Example code: https://github.com/w3c/FileAPI/pull/117

  - Tests: https://crrev.com/c/1529716

  - Primary contacts: @jarryd999, @mkruisselbrink

Further details (optional):

  - [x] I have read and filled out the [Self-Review Questionnare on Security and Privacy](https://www.w3.org/TR/security-privacy-questionnaire/). The assessment is not relevant for this feature.
  - [x] I have reviewed the TAG's [API Design Principles](https://w3ctag.github.io/design-principles/)

You should also know that this is an addition to existing major API that can easily be polyfilled.

We'd prefer the TAG provide feedback as (please select one):

  - [x] open issues in our Github repo for each point of feedback
  - [ ] open a single issue in our Github repo for the entire review
  - [ ] leave review feedback as a comment in this issue and @-notify [github usernames]

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_Please preview the issue and check that the links work before submitting_

For background, see our [explanation of how to write a good explainer](https://w3ctag.github.io/explainers).


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