feat: allow runtime configuration (#253)

[ghassanmas]

Allows frontend-app-gradebook to be configured at
runtime using the LMS's new MFE Configuration API.

Part of openedx/wg-frontend#103

TL;DR - [ A short summary of what this PR does and why ]

JIRA: JIRA-XXXX

What changed?

• [ More in depth breakdown of changes ]
• [ Peripheral things that got changed ]
• [ etc... ]

Developer Checklist

• Test suites passing
• Documentation and test plan updated, if applicable
• Received code-owner approving review
• Bumped version number package.json

Testing Instructions

[ How should a reviewer test this PR? ]

Reviewer Checklist

Collectively, these should be completed by reviewers of this PR:

• I've done a visual code review
• I've tested the new functionality

FYI: @openedx/content-aurora

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[codecov]

Codecov Report

Base: 100.00% // Head: 100.00% // No change to project coverage 👍

Coverage data is based on head (d2723e5) compared to base (03fa143).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@                     Coverage Diff                     @@
##           open-release/olive.master      #282   +/-   ##
===========================================================
  Coverage                     100.00%   100.00%           
===========================================================
  Files                            108       110    +2     
  Lines                           1260      1264    +4     
  Branches                         248       248           
===========================================================
+ Hits                            1260      1264    +4     

Impacted Files	Coverage Δ
src/App.jsx	100.00% <ø> (ø)
src/head/Head.jsx	100.00% <100.00%> (ø)
src/head/messages.js	100.00% <100.00%> (ø)

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[arbrandes]

Looks like a clean cherry-pick from master. +1

[openedx-webhooks]

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