Add support for using this thread pool with coroutines

[DeveloperPaul123]

Note This is on hold until I can ensure that the necessary build flags are properly set in the dp::thread-pool for coroutine support. It seems that down-stream projects for coroutines don't set these in the targets properly but I want dp::thread-pool to do this.

Changes

• Updated CPM.cmake version
• Added schedule() function to allow for running coroutines on the thread pool
• Added batch enqueue() function to better compare to coroutine performance