Add providerInitOptions prop to extend sdk initialization object

[rawpixel-vincent]

Add a prop to be able to pass options to the provider sdk initialization

example with google provider:

<MyGoogleSocialLoginButton
  provider="google"
  appId="xxx"
  providerInitOptions={{ 
    ux_mode: 'redirect',
    redirect_uri: 'https://example.com/social-login/oauth/callback'
  }}
/>