Add a block production benchmark (#10104)

* Add a block production benchmark

* Simplify the block production benchmark

* Cleanups; switch execution strategy to WASM

* Switch WASM execution to `Compiled`

* Reduce the setup cost of the benchmark

Creating all of those extrinsics takes up *a lot* of time, up to the point
where the majority of the time is actually spent *outside* of the code
which we want to benchmark here. So let's only do it once.

* Add a variant of the block production benchmark with proof recording