* impl integrity test for runtime

* Update frame/support/src/traits.rs

Co-authored-by: Bastian Köcher <[email protected]>

* Update frame/support/procedural/src/construct_runtime/mod.rs

Co-authored-by: Bastian Köcher <[email protected]>

* use thread local

* update doc

* Apply suggestions from code review

Co-authored-by: Bastian Köcher <[email protected]>
Co-authored-by: Gavin Wood <[email protected]>