[FEATURE]: add @default directive to GraphQL schema

[rderbier]

Allow user to set a default value on fields for add and update operation.
Allow use of $now to set current date time as default.

Was covered in v21.12
#8017

default value provided as string.
$now replaced by current DateTime on the server.
See PR, investigate if we can add default value for enums.

[gregpavl]

is there any update on this feature?

[jimrazmus]

I am also interested in seeing the @default option added.

[github-actions]

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