add svg fuzzer

Change-Id: I5c4c978c35462e41379939e92fb354dbb40606f8
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/295218
Reviewed-by: Kevin Lubick <kjlubick@google.com>
Commit-Queue: Zepeng Hu <zepenghu@google.com>
3 files changed