5.1.x Jackson 3 make ObjectMapper configurable

### Describe the feature

for jackson 2.x i can access the ObjectMapper used by Vert.x by using DatabindCodec.mapper() and configure it (adding custom modules, enable/disable features etc.)

in jackson 3.x ObjectMapper is immutable and configuration can be done using JsonMapper.builder(). This happens somewhere deep in the Vert.x code and is not accessible from outside.

I would need a hook which either provides a Builder or another way to apply my configurations.

### Contribution

_No response_