Merge branch 'connorjward/fix-flamegraph-output' into 'main'

Fix bugs in flame graph output

See merge request petsc/petsc!3937

Fix xml2flamegraph.py script

Previously this script would output the time spent in both the function
and its callees. For flame graphs this is wrong. Now we use the 'self'
time from the XML to do th

Fix xml2flamegraph.py script

Previously this script would output the time spent in both the function
and its callees. For flame graphs this is wrong. Now we use the 'self'
time from the XML to do things properly.

Update xml2flamegraph.py to accomodate 'other-timed' parts

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Merge branch 'connorjward/add-flamegraph-tool' into 'main'

Add flamegraph generation tool

See merge request petsc/petsc!3607

Add flamegraph generation option to logging output

This commit also adds a Python script to convert the XML logging output
into the same format.