config: allow 'extra' in root of single-project config files #5030
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The 'extra' property was previously only declared for the projects in a multi-project config file. Since unknown fields are considered an error when parsing single-project config files, this made it impossible to include arbitrary metadata via a package.json config or a relay.config.json file. Allow 'extra' at the root of a single-project config file to better-match the structure of projects in a multi-project config.
fixes #5029