Moving messages code to pallet (#2180)

* moved files around

* and fix compilation

Move Chain::ID from relay-level Chain to primitives-level Chain (#2181)

* move Chain::ID from relay-level Chain to primitives-level Chain

* removed chain IDs from bp-runtime

* add missing file header

Adjust weights (#2185)

fix clippy (#2186)

Remove source header chain (#2183)

* moved messages proof verification to messages pallet

* removed SourceHeaderChain

* cleanup

* benchmarks compilation

* fix benchmark tests compilation

* clippy

* fmt

Use compact proofs for messages delivery confirmation (#2187)

* Use compact proofs for messages delivery confirmation

* Fix benchmarks

Move messages delivery proof verification to pallet (#2189)

* rename messages_proof.rs to proofs.rs

* moved delivery proof verification to the messages pallet

* removed TargetHeaderChain

* cleaning up

* fixed benchmarks compilation

* Update modules/messages/README.md

Co-authored-by: Adrian Catangiu <[email protected]>

* uncommented test and removed printlns

* vec![].into_iter().collect() -> vec![].into()

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Co-authored-by: Adrian Catangiu <[email protected]>

removed MaxUnrewardedRelayerEntriesAtInboundLane and MaxUnconfirmedMessagesAtInboundLane from messages pallet config (#2190)

* removed MaxUnrewardedRelayerEntriesAtInboundLane and MaxUnconfirmedMessagesAtInboundLane from messages pallet config

* fixed doc

* fixed benchmarking code

* more fixes

remove MaximalOutboundPayloadSize and use BridgedChain::maximal_incomging_message_size instead (#2191)

remove MessageBridge trait (#2192)