Add fuzzing hooks for clojure stdlib functions

[zgtm]

This PR adds the capability to hook functions written in clojure.

Since calling clojure functions just calles the general clojure.lang.IFn.invoke(), we don't know what function we're dealing with when hooking this function call.

In order to know the function name, we also hook the call to clojure.lang.Var.getRawRoot() call, which does return information about the function name (at least for non-anonymous functions). We mark the functions objects we're interested in, by adding them to a WeakHashMap markedObjects and looking them up on clojure.lang.IFn.invoke().

[fmeum]

From the perspective of maintenance, it would be great if you could, now that we see the hooks work, port them over to use only the public API for hooks and move them to the sanitizers directory.

If any public API is missing (e.g. for integer compares), let's add it in a separate commit.

[zgtm]

From the perspective of maintenance, it would be great if you could, now that we see the hooks work, port them over to use only the public API for hooks and move them to the sanitizers directory.

If any public API is missing (e.g. for integer compares), let's add it in a separate commit.

Yes, I'll try to do that!

For the integer comparisons I did not write any new hooks, but just used existing ones. Should those still be copied to sanitizers/ or can they stay where they are right now?

[zgtm]

@fmeum I've still kept most of the clojure hooks in TraceCmpHooks, even though they are now their own functions, because they are so similar to the existing hooks. Are you on board with that?