Revise how staking configurations are set (#10955)

* Revise how staking configurations are set

fixes #10938

* Fix and add additional tests

* Format

* Formatting

* Add doc

Co-authored-by: Kian Paimani <[email protected]>

* Update frame/staking/src/tests.rs

Co-authored-by: Kian Paimani <[email protected]>

* Format

* Fix build

* Update weights.rs

* cargo run --quiet --profile=production  --features=runtime-benchmarks --manifest-path=bin/node/cli/Cargo.toml -- benchmark --chain=dev --steps=50 --repeat=20 --pallet=pallet_staking --extrinsic=* --execution=wasm --wasm-execution=compiled --heap-pages=4096 --output=./frame/staking/src/weights.rs --template=./.maintain/frame-weight-template.hbs

Co-authored-by: Shawn Tabrizi <[email protected]>
Co-authored-by: Kian Paimani <[email protected]>
Co-authored-by: Parity Bot <[email protected]>