improve Ada exception catchpoint GDB/MI *stopped notification

[Joel Brobecker]

Many thanks to Tom for the clarifications regarding the ui_out
handling.  I think I was able to come up with a version of the code
that minimizes the use of the is-mi-like routine.

Attached is the patch that I propose to commit, with documentation
of the new GDB/MI field.

Tested on x86_64-linux. I created a testcase for it, but had to put it
in gdb.ada, because the testing infrastructure expects the gnat_ada.gpr
file to be present in the parent directory where the inferior sources
are (ie gdb.ada) in order to build Ada programs.

-- 
Joel
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