Add Limit to Tranasctional Layers (#10808)

* introduce hard limit to transactional

* add single layer transactional

* remove single_transactional

* Update mod.rs

* add tests

* maybe fix contracts cc @athei



* fmt

* fix contract logic

* Update frame/contracts/src/exec.rs

Co-authored-by: Alexander Theißen <[email protected]>

* Update exec.rs

* add unchecked and custom errors

* Update lib.rs

* Apply suggestions from code review

Co-authored-by: Alexander Theißen <[email protected]>

* Replace storage access by atomics

Co-authored-by: Alexander Theißen <[email protected]>