Allow stacktrace processing when using structured logging

[michaldo]

Structured logging significantly simplifies production setup. Unfortunately, missing equivalent of ShortenedThrowableConverter is disqualifying.

It is not just readability issue. Uncontrolled stacktraces can exceed log buffer, break parsing JSON and finally "hide" from search engine
Ref: https://stackoverflow.com/questions/79294615/shortenedthrowableconverter-in-spring-boot-3-4-structured-logging

[mhalbritter]

For reference, ShortenedThrowableConverter is from logstash-logback-encoder and can be found here.

[philwebb]

Stacktrace processing was also discussed in #42486

[philwebb]

Collating references for ideas:

• https://github.com/mp911de/logstash-gelf/blob/main/src/main/java/biz/paluch/logging/StackTraceFilter.java
• https://github.com/logfellow/logstash-logback-encoder/blob/main/src/main/java/net/logstash/logback/stacktrace/ShortenedThrowableConverter.java