Python : Unable to follow taint through indirect calls

Hello, I am trying to create a few dataflow queries for python and I noticed that the Dataflow module is unable to do taint tracking through indirect calls.

```py
def test1(arg : str):
print(f"test1 {arg}")

def test2(arg : str):
print(f"test2 {arg}")

funcmap = {
"test1" : test1,
"test2" : test2}

funclist = [test1, test2]

def foo(arg1 : str, arg2 : int):
global funclist, funclist
func_name = None
if arg2 == 1:
func_name = "test1"
out = 0
else:
func_name = "test2"
out = 1
funcmap[func_name](arg1)
funclist[out](arg1)

foo("hello", 1)
foo("world", 2)
```

Here, when I try to track flows from foo -> test1 or test2. The dataflow module can't find them.

Here is the query that I was using -

```ql
module MyConfiguration implements DataFlow::ConfigSig {
private DataFlow::ParameterNode funcSourceCall() {
exists(Function func |
func.getName() = "foo" |
result.getParameter() in [func.getArg(0)]
)
}

private DataFlow::ParameterNode funcSinkCall() {
exists(Function func |
func.getName() = "test2" |
result.getParameter() in [func.getArg(0)]
)
}

predicate isSource(DataFlow::Node source) {
source = funcSourceCall()
}

predicate isSink(DataFlow::Node sink) {
sink = funcSinkCall()
}
}

module RemoteToFileFlow = TaintTracking::Global;
from DataFlow::Node src, DataFlow::Node sink
where RemoteToFileFlow::flow(src, sink)
select sink.asExpr(), src, sink, "Src to Sink"
```

Is this not supported by CodeQL (or maybe I am doing something wrong)? if so - is there a hackish way I can enable tracking - maybe by modifying the Control Flow Graph?