Return ResolvedKeystoneConfig instead of KeystoneConfig

[gautamsi]

• renamed __ResolvedKeystoneConfig to ResolvedKeystoneConfig;
• Return default config from config function so that any config wrapper can make use of defaults.
• config() now returns ResolvedKeystoneConfig instead of KeystoneConfig
• withAuth input now needs ResolvedKeystoneConfig

Breaking changes due to type change, There is no migration needed in most cases instead of type casting in some case.

Changes only needed in advanced use case like manually running the dev/build process instead of cli

[codesandbox-ci[bot]]

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