Allow overriding JobParametersConverter for spring batch auto-configuration

[pPanda-beta]

Since spring-projects/spring-batch#4650 (comment) is closed and there is an way to override the JobParametersConverter in org.springframework.batch.core.configuration.support.DefaultBatchConfiguration it would be very convenient if spring boot auto configuration also allows this.
Right now

class BatchAutoConfiguration.SpringBootBatchConfiguration does not override

protected JobParametersConverter getJobParametersConverter()

spring-boot/spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/batch/BatchAutoConfiguration.java

Line 99 in 4a2c26e

static class SpringBootBatchConfiguration extends DefaultBatchConfiguration {

And the only alternative workaround is to utilize the BatchConversionServiceCustomizer and install converters per type, while most parameter objects are data classes, and can easily be handled by json serialization.
Explained in details here

cc: @fmbenhassine

[quaff]

What a coincidence! I created PR GH-44799 just now.

[wilkinsona]

Closing in favor of #44799. Thanks for the PR, @quaff.