Create sp-weights crate to store weight primitives (#12219)

* Create sp-weights crate to store weight primitives

* Fix templates

* Fix templates

* Fixes

* Fixes

* cargo fmt

* Fixes

* Fixes

* Use deprecated type alias instead of deprecated unit types

* Use deprecated subtraits instead of deprecated hollow new traits

* Fixes

* Allow deprecation in macro expansion

* Add missing where clause during call macro expansion

* cargo fmt

* Fixes

* cargo fmt

* Fixes

* Fixes

* Fixes

* Fixes

* Move FRAME-specific weight files back to frame_support

* Fixes

* Update frame/support/src/dispatch.rs

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

* Update frame/support/src/dispatch.rs

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

* Update frame/support/src/dispatch.rs

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

* Add missing header

* Rewrite module docs

* Fixes

* Fixes

* Fixes

* Fixes

* cargo fmt

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