refactor(express): expose ExpressAuthConfig

[reslear]

right now we use:

export const authConfig: Parameters<typeof ExpressAuth>[0] = {
  providers: [],
  session: {
    strategy: 'jwt',
  },
}

after

export const authConfig: ExpressAuthConfig = {
  providers: [],
  session: {
    strategy: 'jwt',
  },
}

And solves code duplication .

about tests and documentation, please tell me where to look :)

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