CodeQL: disable C/C++ and Java/Kotlin (#805)

The default config automatically detects the languages on the repo but
it complains it doesn't know how to compile our C/C++ and our Java
stuff, so let's disable them for now.

Author: mbouaziz

codeql-config.yml

@@ -0,0 +1,9 @@
+disable-default-queries: true
+
+queries:
+  - exclude: 
+      language: cpp
+  - exclude: 
+      language: java
+  - exclude: 
+      language: kotlin