Add support for prefix and suffix on @JsonAnySetter annotation

[alxxyz]

In our POJO we have 2 Map fields and both have keys prefixes.
So it will very help if @JsonAnySetter annotation will support some prefixes and suffixes.

class Request {

    @JsonAnySetter(prefix="loc_")
    private Map<String, String> location;
    
    @JsonAnySetter(prefix="u_")
    private Map<String, String> user;
}

[cowtowncoder]

Contributions welcome!

[alxxyz]

@cowtowncoder can you please help to understand the flow to add this functionality?

1. to create PR to change the @JsonAnySetter annotation
2. to create PR in https://github.com/FasterXML/jackson-databind to test new functionality?

[cowtowncoder]

@alxxyz Yes, jackson-databind has the annotation introspectors. Testing would probably require local snapshot builds.

[slovdahl]

Just to add some more context, this would also be helpful as an alternative to JsonUnwrapped not working for Map<T, V> (FasterXML/jackson-databind#171). Right now it's easy to serialize POJOs using @JsonAnyGetter but deserializing is not as safe because @JsonAnySetter would put any extra fields not matching any other annotation in the same @JsonAnySetter map.

Also slightly related to FasterXML/jackson-databind#2877.