Use ApplicationPidFileWriter for Core Modules

[BlackRose01]

Hello,

could you please implement the ApplicationPidFileWriter for each Core Module? It's very helpful to check if the core module is running or not.

KR,
BlackRose01

https://docs.spring.io/spring-boot/docs/current/api/org/springframework/boot/context/ApplicationPidFileWriter.html

[borditamas]

Should be considered in v5