Merkle Mountain Range & BEEFY integration (#2101)

* Switch branch.

* Implement basic MMR leaf.

* Revert "Switch branch."

This reverts commit 7f4d41c67f27ca560c53fc63fd3bd06ac182403c.

* Bump substrate.

* Integrate BEEFY.

Bump all.

Fix missing imports.

* Use beefy pallet to get authorities.

* Bump BEEFY repo.

* Use next authority set instead of the current one.

* Start BEEFY service.

* Fix BEEFY start up.

* Cache BEEFY authority set.

* Add BEEFY ValidatorSetId to MMR

* Fix code.

* Apply suggestions from code review

Co-authored-by: André Silva <123550+andresilva@users.noreply.github.com>
Co-authored-by: Hernando Castano <HCastano@users.noreply.github.com>

* Review grumbles.

* Update beefy repo.

* Work-around missing protocol.

* Revert "Work-around missing protocol."

This reverts commit 0a6257a8bccc1c67e966898cdedc408c6469ffd6.

* Add beefy peers set config.

* Expose storage of BEEFY.

* Uncompress BEEFY keys for merkle tree.

* Update ordering.

* Switch to branch.

* Bump deps.

* Switch to custom beefy.

* Add MMR RuntimeApi and custom rpc.

* Add set length details.

* Fix compilation.

* Expose MmrLeaf storage.

* Expose MmrLeaf storage.

* Don't use session handler, and rather compute & cache beefy details on call.

* Don't use session handler, and rather compute & cache beefy details on call.

* Fixes.

* Update Cargo.lock.

* Switch back to master.

* Update lockfile.

* Fix xcm print issue.

* Cargo.lock.

* Use master branch.

* Remove extra dep.

* Fix tests.

* Update Cargo.lock

* Add BEEFY & MMR to westend.

* Implement session keys migration.

* Update testnet script.

* start BEEFY for all node types

* Update Cargo.lock

* fix Cargo.toml

* resolve another merge conflict

* add Westend BEEFY keys

* Apply suggestions from code review

Co-authored-by: Hernando Castano <HCastano@users.noreply.github.com>

* Update BEEFY.

* Add Rococo BEEFY keys

* resolve merge issue

* fix pallet indices

* fix Westend OldSessionKey

* remove unused imports in Westend runtime

* Fix compilation for Westend.

* address review

* start BEEFY gadget conditionally

* address review again

* fix typo

* remove duplicate

* remove another duplicate

* well

* add missing stuff

* cleanup Cargo.toml files

- revert unnecessary changes
- add missing /std dependencies
- remove unused dependencies

* runtime: remove unused structs from rococo runtime

* node: cleanup service

Co-authored-by: André Silva <123550+andresilva@users.noreply.github.com>
Co-authored-by: Hernando Castano <HCastano@users.noreply.github.com>
Co-authored-by: adoerr <0xad@gmx.net>
Co-authored-by: André Silva <andrerfosilva@gmail.com>