Support max length setting on exception message (to be used with ShortenedThrowableConverter.maxLength)

[gauravsaralMs]

Is your feature request related to a problem? Please describe.
Currently if ShortenedThrowableConverter.maxLength is set to any value (say 1000) then that includes the exception message as well as stack trace length.
In case someone adds a large/dynamic exception message then it is possible that the whole stack trace is lost.

Describe the solution you'd like
proposal is to include a setting ShortenedThrowableConverter.maxErrorMessageLength which can be used to limit the length of error message being included.
So with maxErrorMessageLength set as 100 and maxLength set as 1000 it can be guaranteed that 900 limit will be used for stack traces.

Describe alternatives you've considered
N/A

Additional context
N/A

[gauravsaralMs]

@philsttr gentle ping to please take a look at this issue.

I am open to contributing this feature but want to confirm that this feature sounds good be added.