Fix Compiler Warnings (new rustc) (#8907)

* unused mmr

* more unused

* dyn in executor

* remove `doc(inline)`

* fix dyn for sp-api-test

* update benchmarks

* Update primitives/core/benches/bench.rs

* Update primitives/core/benches/bench.rs

* update another bench

* fix benchmark?

Co-authored-by: adoerr <0xad@gmx.net>