* 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]>

* complex headers+messages relay

* post-merge fix

* fix + test issue with on-demand not starting

* Move estimate-fee

* Add parsing test.

* Address review comments.

* Fix compilation.

* Move things around.

Co-authored-by: Svyatoslav Nikolsky <[email protected]>

* Send Message WiP

* It compiles.

* Add tests.

* Use common macro.

* Nicer balance display.

* Get rid of redundant send_message_call function.

* Fix clippy.

Co-authored-by: Svyatoslav Nikolsky <[email protected]>

* Encode message.

* Update docs related to `sender`

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

* Add tests.

* Fix default and conflicting options.

* Fix default variant.

* Update tests.

* Remove `pallet-substrate-bridge`

* Fix transfer call encoding test

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

* administrative metrics

* fmt

* fix compilation

* fix compilation again

* and another one

* remove GenericLoopMetrics

* chttp -> isahc

* remove redundant marker

* not about price metrics

* fmt

* Encode Call & Multiple Bridge Instances.

* Remove redundant clone.

* Fix comment.

* Rename pallet index bridge instance index.

* Update error messages related to target instances

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

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

* Move derive account.

* Fix account derivation.

* Relay Messages.

* Fix docs.

* Fix copyright date.

* copyright increment

Co-authored-by: adoerr <[email protected]>

* 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]>