* Adds support for checking the timestamp inherent while validating a block

This adds support for checking the timestamp inherent while validating a
block. This will use the relay chain slot number * relay chain slot
duration to calculate a timestamp. This timestamp is used to check the
timestamp in the timestamp inherent.

* Update polkadot-parachains/rococo-runtime/src/lib.rs

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

* Update polkadot-parachains/statemine-runtime/src/lib.rs

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

* Update primitives/timestamp/src/lib.rs

Co-authored-by: André Silva <[email protected]>

* Fix warnings

Co-authored-by: Shawn Tabrizi <[email protected]>
Co-authored-by: André Silva <[email protected]>

* Start

* More work

* Add proc-macro for `validate_block`

* Make everything compile

* Add some test

* session weight

* decouple session benchmarking and collator selection

* removed mock

* licensing

* benchmarking script

* set benchmarking into runtime

* Update scripts/benchmarks.sh

* real weights

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

This is basically a hack that prevents the inclusion of `:code` in the
storage proof. A proper fix requires some changes to the trie crate to
not include nodes that aren't read.

* update substrate

* try again

* Add Statemint

* Versioning.

* Fixes

* Fixes

* Fixes

* Fixes

* Fixes

* Benchmarking

* kick patch (paritytech/statemin#88)

* Westmint Chain Spec (paritytech/statemint#90)

* Tidy the common .toml

* Update weights

* add westmint sudo key comment

* Port consensus stuff

* fix typo

* fix typo ... again

* Recognise Westmint

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