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ARROW-11617: [C++][Gandiva] Fix nested if-else optimisation in gandiva

In gandiva, when we have nested if-else statements we reuse the local bitmap and treat it is a single logical if - elseif - .. - --else condition. However, when he have say another function between them like
IF
THEN
ELSE
   function(
     IF
     THEN
     ELSE
  )

in such cases also currently we are doing same thing which can lead to incorrect results

Closes #9486 from projjal/fixifelseopt and squashes the following commits:

ad383826f <Projjal Chanda> add a projector test
a655fc080 <Projjal Chanda> remove extraneous include
1dc2df7a8 <Projjal Chanda> add unit tests
30d99a3b4 <Projjal Chanda> fix nested if else optmisation

Authored-by: Projjal Chanda <iam@pchanda.com>
Signed-off-by: Praveen <praveen@dremio.com>