.graphqls file support

[kikuchy]

Thank you for developing awesome libraries!

Our team is considering to use graphql_codegen for new Flutter application.
And the server side application already have GraphQL scheme definitions as .graphqls files.
Current graphql_codegen doesn't support .graphqls files, we have to copy and rename .graphqls files to .graphql and have to sync it manually.
It's perfect for us if graphql_codegen supports .graphqls` files, so we hope it.

Is there any plans to support .graphqls files? Thank you!

[github-actions]

👋 @kikuchy
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[budde377]

Im sure we can accommodate this