Add missing attributes to ServletRegistration annotation

[mhalbritter]

ServletRegistrationBean has those properties, but @ServletRegistration hasn't:

• initParameters
• multipartConfig

[dmytrodanilenkov]

@wilkinsona you closed PR by mistake #45006 looks like you confused two similar issues

[dmytrodanilenkov]

@mhalbritter are you sure about servletRegistrationBeans? there is no corresponding field or method in the standard ServletRegistrationBean code. Could you clarify if you are expecting a custom extension method/property to merge multiple registration beans, or if you planned something else?

[mhalbritter]

Superseded by #45007.