In 362da640dd18 "[SandboxIR][Bench] Test RAUW (#107440)" we started
using std::stringstream, but didn't include `<sstream>` for the
definition. This is resulting in a build failure on windows.
This patch adds a new benchmark suite for SandboxIR. It measures the
performance of some of the most commonly used API functions and compares
it against LLVM IR.
