This prs cleans up some of the frame benchmarking stuff:
- Move CLI into `frame-benchmarking-cli`. No frame related CLI should
exists in the default Substrate CLI.
- Move all traits and types related to frame benchmarking into the
`frame-benchmarking` trait. Frame types should be isolated in Frame.
* Initial transfer bench
* Add best case
* Transfer keep alive
* Set balance benchmarks
* Bump impl
* Fix text
Co-authored-by: Gavin Wood <github@gavwood.com>