[I] [C++] Add `OptionalBitmapAnd` utility [arrow]

[via GitHub]

pitrou opened a new issue, #45819:
URL: https://github.com/apache/arrow/issues/45819

   ### Describe the enhancement requested
   
   We currently have `BitmapAnd` utility functions that return the conjunction 
of two bitmaps.
   However, null bitmaps are optional which complicates things when conjoining 
two null bitmaps. It would be good to centralize that functionality in a 
dedicated utility function, for example:
   ```c++
   ARROW_EXPORT
   Result<std::shared_ptr<Buffer>> OptionalBitmapAnd(
       MemoryPool* pool,
       const std::shared_ptr<Buffer>& left, int64_t left_offset,
       const std::shared_ptr<Buffer>& right, int64_t right_offset,
       int64_t length, int64_t out_offset);
   ```
   
   
   ### Component(s)
   
   C++


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