lottie/render: Added custome future/promise to optimize the heap allocation.

lottie/render: Added custome future/promise to optimize the heap allocation.
As every future/promise shared data allocates in heap there was
lot of heap allocation when we generate span info using RleThread pool.
this custome future/promise will allocate 1 shared resource per drawable and
will reuse for all subsequent span info request for that drawable.

This reduced the number of heap allocation drastically and improves render performance.

Change-Id: Ic480030e7c36ad7ab730683e71417de026220297