Input extensions, needed for automatic peristed queries

[basvandriel]

Related to #1707. This requires support for the underneath example in the curl command. See the documentation here.

curl --get http://localhost:4000/graphql \
  --header 'content-type: application/json' \
  --data-urlencode 'extensions={"persistedQuery":{"version":1,"sha256Hash":"ecf4edb46db40b5132295c0291d62fb65d6759a9eedfa4d5d612dd5ec54a6b38"}}'

Feature Request Type

• [x] Core functionality
• [x] Alteration (enhancement/optimization) of existing feature(s)
• [x] New behavior

Description

For sending across extra input data, without a query for example in the automatic persisted queries example, the extensions input can be of use. See example above.

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