feat: graphiql page

[rot1024]

Overview

reearth/reearth-visualizer#89

Add GraphiQL page to enable to debug GraphQL

• URL: /graphql
• An access token will be automatically injected to headers
• Not available on production build

Why GraphiQL, not GraphQL Playground?

• graphql-playground-react has a dependency to Redux
• Error were occurred when I tried graphql-playground-react and it did not work
• GitHub adopts GraphiQL on the GraphQL playground page for GitHub GraphQL API

Screenshot

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[codecov]

Codecov Report

Merging #70 (d725ed3) into main (ea980cb) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #70   +/-   ##
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  Coverage   58.10%   58.10%           
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  Files          40       40           
  Lines         685      685           
  Branches       96       96           
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  Hits          398      398           
  Misses        245      245           
  Partials       42       42           

[HideBa]

LGTM 👍
Plz, write docs if it's needed.

[KaWaite]

Just fixed grammar for the message if not logged in. Other than that change LGTM!