Add info to custom resolvers and add formatError to GraphQL service

[iicdii]

Description of what you did:

1. Add info to custom resolvers

I added info argument to custom resolvers, which has useful informations such as operation name, request query body and so on.

  resolver: async (
    obj,
    options,
    ctx,
    info // it was missing
  ) => {
  
  }

2. Add formatError service

Apollo-server supports formatting error, but so far there has been no way to use this option. So I add formatError service and connect to ApolloServer options, so that users can customize it by adding service in extensions/graphql/services/format-error.js.

Usage example

// extensions/graphql/services/format-error.js
const Sentry = require('@sentry/node');

const formatError = err => {
  Sentry.captureException(err.originalError);
  return err;
};

module.exports = {
  formatError,
};

As you see in the example, it's useful when you use error tracking tools like Sentry. For now you can't capture GraphQL error anywhere, because GraphQL plugin hook runs after all middleware and hooks.

[codecov]

Codecov Report

Merging #6524 into master will increase coverage by 0.13%.
The diff coverage is 90.90%.

@@            Coverage Diff             @@
##           master    #6524      +/-   ##
==========================================
+ Coverage   19.85%   19.98%   +0.13%     
==========================================
  Files         857      858       +1     
  Lines       12076    12097      +21     
  Branches     1963     1965       +2     
==========================================
+ Hits         2398     2418      +20     
- Misses       8093     8094       +1     
  Partials     1585     1585              

Flag	Coverage Δ
#front	14.67% <50.00%> (+<0.01%)	⬆️
#unit	41.71% <95.00%> (+0.45%)	⬆️

Impacted Files	Coverage Δ
...admin/src/containers/InstalledPluginsPage/index.js	7.14% <ø> (ø)
...kages/strapi-admin/admin/src/translations/index.js	100.00% <ø> (ø)
...-manager/admin/src/components/DynamicZone/index.js	0.00% <ø> (ø)
...in-content-manager/admin/src/translations/index.js	0.00% <ø> (ø)
...lder/admin/src/containers/FormModal/utils/forms.js	0.00% <0.00%> (ø)
...ntent-type-builder/admin/src/translations/index.js	0.00% <ø> (ø)
...ugin-documentation/admin/src/translations/index.js	0.00% <ø> (ø)
...trapi-plugin-email/admin/src/translations/index.js	0.00% <ø> (ø)
.../containers/InputModalStepper/InputModalStepper.js	0.00% <ø> (ø)
...-upload/admin/src/containers/ModalStepper/index.js	0.00% <ø> (ø)
... and 6 more

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[alexandrebodin]

LGTM