Expose `getConverter()` in `StdDelegatingSerializer` for improved customizability

[k163377]

Is your feature request related to a problem? Please describe.

Currently, it is difficult to achieve customization of StdDelegatingSerializer using a specific Converter via BeanSerializerModifier#modifySerializer.
handledType is always Object, and accessing the Converter requires defining a dedicated subclass of StdDelegatingSerializer.

Personally, I think it might be acceptable to expose accessors to the Converter. What do you think?
It would be great if this were available starting in 2.20.1, but since it's a functional change, I expect it will be merged into 2.21.0.

Describe the solution you'd like

SSIA

https://github.com/FasterXML/jackson-databind/compare/2.x...k163377:delegating-serializer-generics?expand=1

Usage example

No response

Additional context

No response

[cowtowncoder]

You mean changing this in StdDelegatingSerializer.java

    protected Converter<Object, ?> getConverter() {
        return _converter;
    }

to be public? If so, seems reasonable.

And yes, API change needs to go in 2.21.0 unfortunately.