Add cflite and document normalize path

[DavidKorczynski]

Resolving: #251 (comment)

I also added a ClusterFuzzLite integration with the harness described in the issue.

The harness will be run when PRs are made against uvwasi.

To run the harness manually locally:

git clone https://github.com/google/oss-fuzz
git clone https://github.com/DavidKorczynski/uvwasi
cd uvwasi
git checkout enable-cflite

# Build the fuzzers in .clusterfuzzlite
python3 ../oss-fuzz/infra/helper.py build_fuzzers --external $PWD

# Run the fuzzer for 10 seconds
python3 ../oss-fuzz/infra/helper.py run_fuzzer --external $PWD fuzz_normalize_path -- -max_total_time=10

Fixes: #251

[mhdawson]

@DavidKorczynski thanks, one more ask would be to add the instructions on how to run the fuzzers to the main readme. I think a section at the bottom titled 'Running the fuzzers locally' or something like that containing what you have in the description above would make it easier to find/run.

[mhdawson]

Overall LGTM with a suggestion

[DavidKorczynski]

Overall LGTM with a suggestion

done

[mhdawson]

LGTM

[mhdawson]

@DavidKorczynski thanks for the doc/contribution.