Compatibility with Hasura graphql-default naming convention

[jannehietamaki]

Hi,

In order to be compatible with Hasura graphql-default naming convention two changes would be needed in metadata/hasura.go.

With graphql-default these are differently in the api:
affected_rows becomes affectedRows
and
pk_columns becomes pkColumns

I guess it would make sense to make these somehow configurable?

[stale]

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