(v3 alpha, fix) Update client remote to use MainRouter

[mcous]

overview

#352 changed the shape of the RPC remote object. This PR fixes the client breakage due to that change. While I was here, I also fixed the API make install task, because it wasn't quite right.

This PR includes:

• Chore work
• Bug fixes
• Backwards-compatible feature additions
• Breaking changes
• Documentation updates
• Test updates

changelog

• (Chore) Update API make install to use pip install -e .
• (Fix) Update API client to expect opentrons.api.MainRouter as the remote object
• (Tests) Update API client tests to for the above fix

review requests

I would love to merge this ASAP, so please review in the next 30 minutes. If you're on your phone, this PR is small enough that you should be able to review it from the mobile site without issue.

[codecov]

Codecov Report

Merging #359 into app-3-0-alpha will not change coverage.
The diff coverage is 100%.

@@              Coverage Diff               @@
##           app-3-0-alpha     #359   +/-   ##
==============================================
  Coverage          82.09%   82.09%           
==============================================
  Files                 86       86           
  Lines               4877     4877           
==============================================
  Hits                4004     4004           
  Misses               873      873

Impacted Files	Coverage Δ
app/ui/robot/api-client/client.js	33.69% <100%> (ø)	⬆️

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[Kadee80]

LGTM