Warn validators with slow hardware (#12620)

* move Metric

* run hardware bench if validiator flag is being used

* fix rustdoc & update node-template

* fix

* unused improt

* warn

* move Requirement

* bench_result

* ensure_requirements

* make the code compile

* check if authority

* Update client/sysinfo/src/sysinfo.rs

Co-authored-by: Oliver Tale-Yazdi <[email protected]>

* nit fixes

* warning signs

* Update client/sysinfo/src/sysinfo.rs

Co-authored-by: Oliver Tale-Yazdi <[email protected]>

Co-authored-by: Oliver Tale-Yazdi <[email protected]>