* Add modules for Rococo<>Westend header sync

* Use mock Westend and Rococo finaltiy tx calls

* Add Westend<>Rococo variants to `init_bridge`

* Add Westend<>Rococo variants to `relay_headers`

* Simplify the Rococo and Westend signing params

* Add `submit_finality_proof` mock Call variant

* Add note to more closely match `initialize` Call variant

* Accidentally committed `cargo-expand`ed code 🤦



* Add `initialize` Call variant to Rococo mock

* Fix call enums.

* Add explainatory comment.

* clippy.

* Add issue number.

* De-duplicate metrics customisation.

* Add comments to Rococo/Westend runtimes.

* Add scale-encoding compatibility test.

* Fix tests.

* Clippy.

Co-authored-by: Tomasz Drwięga <[email protected]>

* Copy-Pasta Call code from mock Rococo to mock Westend runtime

* Update Westend client to include signing and call related code

* Add missing part of license header

* Move `account_info_storage_key` to `polkadot-core` crate

* Start generalizing rialto-millau commands.

* cargo fmt --all

* Introduce generic balance.

* Unify message payloads.

* cargo fmt --all

* init - generic

* Attempt to unify send message.

* Start moving things around.

* cargo fmt --all

* Move init-bridge.

* cargo fmt --all

* Improve UX of bridge argument.

* Fix clippy.

* Fix docs and scripts.

* Add docs.

* Apply suggestions from code review

Co-authored-by: Hernando Castano <[email protected]>

* Fix copyright.

* Add issue numbers.

* More todos.

* Update comments.

Co-authored-by: Hernando Castano <[email protected]>

* Remove chains.

* Move relay clients.

* Flatten generic.

* Fix fmt.

* use runtime:: prefix for message-lane pallet traces

* renamed message-lane (module and primitives) folder into messages

* replace "message lane" with "messages" where appropriate

* Move chain primitives to a sub-folder.

* Update workspace members.

* Extract core parts of polkadot.

* cargo fmt --all

* Remove TODO.

* cargo fmt --all

* Fix crate names.

* Add to the latest API.

* cargo fmt --all

* Add nested lock files to ignore (generated during cargo fmt)

* Fix compilation.

* cargo fmt --all

* Fix ignore pattern.

* Address review comments.