fuzz: add fuzzer testing nDPI (initial) configurations (#1830)

The goal of this fuzzer is to test init and deinit of the library, with
different configurations. In details:
* random memory allocation failures, even during init phase
* random `ndpi_init_prefs` parameter of `ndpi_init_detection_module()`
* random LRU caches sizes
* random bitmask of enabled protocols
* random parameters of `ndpi_set_detection_preferences()`
* random initialization of opportunistic TLS
* random load/don't load of configuration files

This new fuzzer is a C++ file, because it uses `FuzzedDataProvider`
class (see
https://github.com/google/fuzzing/blob/master/docs/split-inputs.md).
Note that the (existing) fuzzers need to be linked with C++ compiler
anyway, so this new fuzzer doesn't add any new requirements.

.github/workflows/cifuzz.yml

@@ -18,7 +18,7 @@ jobs:
         uses: google/oss-fuzz/infra/cifuzz/actions/run_fuzzers@master
         with:
           oss-fuzz-project-name: 'ndpi'
-          fuzz-seconds: 900
+          fuzz-seconds: 1200
           dry-run: false
           sanitizer: ${{ matrix.sanitizer }}
       - name: Check Crash (fails when a crash is detected)