Add CIFuzz

[AdamKorcz]

Adds CIFuzz. This will run the fuzzers during pull requests for 600 seconds. The time can be modified.

CIFuzz is an addition to ArduinoJson's OSS-fuzz integration. The documentation for CIFuzz can be found here: https://google.github.io/oss-fuzz/getting-started/continuous-integration/

The existing fuzzers are found here: https://github.com/bblanchon/ArduinoJson/tree/6.x/extras/fuzzing

[coveralls]

Coverage remained the same at 99.463% when pulling c60ebda on AdamKorcz:fuzz1 into 5ed5f36 on bblanchon:6.x.

[bblanchon]

Thanks, @AdamKorcz; I didn't know about CIFuzz.
I'm already fuzzing the library as part of the CTest run, but CIFuzz seems to offer a cleaner solution, so I think I'll remove that.
Also, I think it makes sense to run CIFuzz after all builds succeeded and not in parallel.
Do you mind if I alter your PR before merging it?

[AdamKorcz]

Do you mind if I alter your PR before merging it?

Not at all.

[bblanchon]

@AdamKorcz, I noticed you created the same PR in dozens of repositories; what's up with that?

[AdamKorcz]

@bblanchon I am a contributor to OSS-fuzz and fuzzing of open source software in general.

See list of OSS-fuzz contributors: https://github.com/google/oss-fuzz/graphs/contributors

See also https://adalogics.com/blog/fuzzing-100-open-source-projects-with-oss-fuzz for reference

[bblanchon]

Once you have completed an integration OSS-Fuzz offers an integration reward of 500-1000 USD. This is a nice reward for your work, and following the non-trivial effort of integrating your project it is of great pleasure to receive a monetary award.

Given that you created the same PR on the following repos, I'm wondering if you're only looking after the reward 😲

1. Add CIFuzz libass/libass#568
2. Add CIFuzz vitessio/vitess#9084
3. Add CIFuzz libgit2/libgit2#6098
4. Add CIFuzz libarchive/libarchive#1604
5. Add CIFuzz libjpeg-turbo/libjpeg-turbo#559
6. Add CIFuzz grpc-ecosystem/grpc-gateway#2405

Can you confirm that you will not receive any financial reward for these PRs?