Include stacktrace info when stopping at exception breakpoint

[testforstephen]

Current: When Java extension stops at exception breakpoint, it will print the exception message, but without stacktrace info.

Excepted: Like what js debug extension does, print the stacktrace too.

Originally posted by @jvesouza in https://github.com/microsoft/vscode/issues/111758#issuecomment-764504378