Created by: 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