VaadinWebSecurity - private methods cannot be overriden

[corbettcode]

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Describe your motivation

In VaadinWebSecurity the two methods:

getVaadinSavedRequestAwareAuthenticationSuccessHandler(...) createAccessDeniedHandler()

have private access so they cannot be overridden.

Describe the solution you'd like

Make both:

getVaadinSavedRequestAwareAuthenticationSuccessHandler(...) createAccessDeniedHandler()

protected access.

Also, ensure there are getters for all @Autowired attributes.

Describe alternatives you've considered

No response

Additional context

No response