Oss-fuzz ideal integration (#1262)

* Fix watchpoint leak in ARM

* Builds fuzz targets with sanitizer support

* Builds fuzz targets with directory driver

* Adds script to dowlonad public corpus

* Adds CIfuzz

To checks Pull Requests with fuzzing

* Use static library for fuzz targets

* Less verbose logs for fuzz driver directory

qemu/target-arm/unicorn_arm.c

@@ -32,6 +32,7 @@ void arm_release(void* ctx)
     g_free(cpu->cpreg_values);
     g_free(cpu->cpreg_vmstate_indexes);
     g_free(cpu->cpreg_vmstate_values);
+    cpu_watchpoint_remove_all(CPU(cpu), BP_CPU);
 
     release_common(ctx);
 }