[benchmarks] Adding benchmarks for dynamic closure calls.

Bug: #40813
Change-Id: Ifdb7dfef4fc581c14cb570a534a64d73f5be9449
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/160726
Commit-Queue: Tess Strickland <[email protected]>
Reviewed-by: Jonas Termansen <[email protected]>

Author: sstrickl