Starlight <> Ethereum: Slashes mapping

[Agusrodri]

Introduces slashes to be sent to Ethereum from pallet-external-validator-slashes.

Up to now slashes were just recorded but nothing was done with them. This PR changes this by:

• scheduling those slashes to be sent externally at a certain era change.
• Send this slashes in batches of QueuedSlashesProcessedPerBlock. This batches are sent on-initialize of each block, with one batch at most per block
• Introduce the Slashes command which contains: The era in which the slashes are sent, the slashes, and a timestamp. Currently the timestamp is likely wrong, in the future it will contain a timestamp to identify the validators in the external chain.
• Tests validating the approach, both rust and typescript

[github-actions]

WASM runtime size check:

Compared to target branch

dancebox runtime: 1416 KB (no changes) ✅

flashbox runtime: 824 KB (no changes) ✅

dancelight runtime: 2148 KB (+2148 KB) ⚠️

container chain template simple runtime: 1124 KB (-4296 KB) ✅

container chain template frontier runtime: 1400 KB (-5152 KB) ✅

[tmpolaczyk]

Maybe not, use validator.as_ref().to_vec()

[github-actions]

Coverage Report

(master)

@@                   Coverage Diff                   @@
##           master   agustin-map-slashes      +/-   ##
=======================================================
+ Coverage   65.15%                65.70%   +0.55%     
- Files         330                   329       -1     
+ Lines       57796                 58046     +250     
=======================================================
+ Hits        37655                 38139     +484     
- Misses      20141                 19907     -234     

Files Changed	Coverage
/chains/orchestrator-relays/runtime/dancelight/src/lib.rs	68.25% (+0.65%)	✅
/chains/orchestrator-relays/runtime/dancelight/src/tests/common/mod.rs	97.28% (+0.01%)	✅
/chains/orchestrator-relays/runtime/dancelight/src/tests/slashes.rs	98.70% (-1.30%)	❗
/chains/orchestrator-relays/runtime/dancelight/src/weights/pallet_external_validator_slashes.rs	30.77% (+30.77%)	✅
/chains/orchestrator-relays/runtime/dancelight/src/weights/pallet_message_queue.rs	59.55% (+59.55%)	✅
/chains/orchestrator-relays/runtime/dancelight/src/weights/runtime_common_paras_registrar.rs	0.00% (-13.64%)	❗
/chains/orchestrator-relays/runtime/dancelight/src/weights/snowbridge_pallet_outbound_queue.rs	33.33% (+33.33%)	✅
/pallets/external-validator-slashes/src/lib.rs	78.57% (+3.86%)	✅
/pallets/external-validator-slashes/src/weights.rs	14.63% (+14.63%)	✅
/primitives/bridge/src/custom_do_process_message.rs	96.20% (+96.20%)	✅
/primitives/bridge/src/lib.rs	80.45% (+22.65%)	✅

Coverage generated Fri Jan 10 15:15:09 UTC 2025