Streamline frame_system weight parametrization (#6629)

* Basic weights builder.

* Fixing WiP

* Make the tests work.

* Fix weights in node/runtime.

* WiP.

* Update pallets with new weights parameters.

* Validate returns a Result now.

* Count mandatory weight separately.

* DRY

* BREAKING: Updating state root, because of the left-over weight-tracking stuff

* Update tests affected by Mandatory tracking.

* Fixing tests.

* Fix defaults for simple_max

* Update frame/system/src/weights.rs

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

* Rework the API a bit.

* Fix compilation & tests.

* Apply suggestions from code review

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

* Add extra docs & rename few things.

* Fix whitespace in ASCII art.

* Update frame/system/src/limits.rs

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

* Fix max_extrinsic calculations.

* Fix conflicts.

* Fix compilation.

* Fix new code.

* re-remove generic asset

* Fix usage.

* Update state root.

* Update proxy.

* Fix tests.

* Move weights validity to integrity_test

* Remove redundant BlockWeights.

* Add all/non_mandatory comment

* Add test.

* Remove fn block_weights

* Make the macro prettier.

* Fix some docs.

* Make max_total behave more predictabily.

* Add BlockWeights to metadata.

* fix balances test

* Fix utility test.

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