feat: add authorizationParams in oauth config

[atinux]

Resolves #22
Resolves #43 by overwriting redirect_uri in authorizationParams

This pull request introduce authorizationParams option in each OAuth provider, example:

export default oauth.googleEventHandler({
  config: {
    authorizationParams: {
      access_type: 'offline'
    }
  },
  async onSuccess(event, { user }) {
    // ...
  }
})

The authorizationParams can overwrite the generated params we provide and this can be useful in case such as #43

export default oauth.microsoftEventHandler({
  config: {
    authorizationParams: {
      redirect_uri: 'https://my-custom-redirect-uri'
    }
  },
    async onSuccess(event, { user }) {
      // ...
    }
})

[PGLongo]

@atinux I think that #56 doest not fix this.

    if (!code) {
      const scope = config.scope && config.scope.length > 0 ? config.scope : ['User.Read']
      // Redirect to Microsoft Oauth page
      return sendRedirect(
        event,
        withQuery(authorizationURL as string, {
          client_id: config.clientId,
          response_type: 'code',
          redirect_uri: redirectUrl,
          scope: scope.join(' '),
          ...config.authorizationParams
        })
      )
    }

The problem was the line

const redirectUrl = getRequestURL(event).href'

but this line is not affected by #56.

I think that it should be something like:

const redirectUrl = config.authorizationParams?.redirect_uri || getRequestURL(event).href

Do you agree with me?

[atinux]

Actually it's overwritten by the config on https://github.com/Atinux/nuxt-auth-utils/blob/ac9486e634ce12b39048d4016bff651acd082a68/src/runtime/server/lib/oauth/google.ts#L90

Si it should work :)