graph/formats/dot/fuzz: add fuzzer function and corpus
The fuzz corpus was seeded with a small number of hand crafted examples
and occasionally augmented manually by identifying code paths that were
not touched and adding text to target those. Then iterating.
ADD
graph/formats/dot/fuzz/corpus.zip
graph/formats/dot/fuzz/corpus.zip
Binary files /dev/null and b/graph/formats/dot/fuzz/corpus.zip differ

graph/formats/dot/fuzz: add fuzzer function and corpus

The fuzz corpus was seeded with a small number of hand crafted examples
and occasionally augmented manually by identifying code paths that were
not touched and adding text to target those. Then iterating.