Allow disabling batched requests

[mfn]

Summary

• See https://www.apollographql.com/blog/batching-client-graphql-queries-a685f5bcd41b/ for pro/con
• Stays enabled by default but can be disabled if desired
• will return a GraphQL batch compatible error response
  i.e. each batch will return the same error, however not more than 100 such errors are returned

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Type of change:

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update
• Misc. change (internal, infrastructure, maintenance, etc.)

Checklist:

• Existing tests have been adapted and/or new tests have been added
• Add a CHANGELOG.md entry
• Update the README.md
• Code style has been fixed via composer fix-style

[mfn]

Github Actions has some issues, the state does not reflect the current runs. Can be seen via https://github.com/rebing/graphql-laravel/actions/runs/734334562 where everything is green

[mfn]

Note: I've decided to change the config slightly and it's now batching.enable instead of batching (see 89ba2f4 )