Create benchmark page

[clintfred]

We would like to make it easy for those integrating ironweb to run benchmarks for themselves so they can understand how ironweb is impacting their application in their environment.

As a first step, we should provide a self-hosted benchmark page in the ironweb repository. It should cover most SDK functions, and would ideally run each benchmark a number of times and compute averages and median times.

[BobWall23]

Might be able to reuse the benchmarks from the recrypt WASM binding repo.

[clintfred]

This would also be useful for quickly testing across multiple browsers.