Add support for XCM delivery fees in all runtimes

[Agusrodri]

What does it do?

This PR introduces XCM delivery fees to Moonbase, Moonriver and Moonbeam runtimes.

From now on, each XCM functionality that builds and send an XCM message, should account for these extra fees, which correspond to the cost of sending a message through the XCM protocol.

The full amount associated to delivery fees is paid by the account that executes the pallet/precompile call, and it's paid in the origin chain's native balance (DEV, MOVR or GLMR respectively).

Formula to compute delivery fees

To compute the final amount associated to delivery fees, we base on four elements:

• DeliveryFeeFactor: constant stored inside ParachainSystem pallet (for UMP) or XcmpQueue pallet (for HRMP).
• BaseDeliveryFee: constant set in our runtimes.
• TransactionByteFee: constant set in our runtimes.
• XcmMsgBytes: length in bytes of the final XCM message to send.

TotalDeliveryFee = DeliveryFeeFactor * [BaseDeliveryFee + (TransactionByteFee * XcmMsgBytes)]

More context on: paritytech/polkadot-sdk#1234

[github-actions]

Coverage Report

@@                      Coverage Diff                      @@
##           master   agustin-xcm-delivery-fees      +/-   ##
=============================================================
+ Coverage   81.30%                      81.44%   +0.14%     
  Files         301                         301              
+ Lines       85701                       86098     +397     
=============================================================
+ Hits        69675                       70121     +446     
- Misses      16026                       15977      -49     

Files Changed	Coverage
/client/rpc/manual-xcm/src/lib.rs	88.00% (+25.33%)	🔼
/client/rpc/txpool/src/lib.rs	65.38% (+8.65%)	🔼
/client/rpc-core/txpool/src/types/content.rs	70.37% (+1.85%)	🔼
/pallets/erc20-xcm-bridge/src/xcm_holding_ext.rs	100.00% (+5.26%)	🔼
/pallets/moonbeam-xcm-benchmarks/src/weights/generic.rs	4.26% (+1.30%)	🔼
/pallets/moonbeam-xcm-benchmarks/src/weights/mod.rs	13.61% (+1.57%)	🔼
/pallets/xcm-transactor/src/lib.rs	89.49% (+0.05%)	🔼
/primitives/xcm/src/origin_conversion.rs	92.86% (+17.86%)	🔼
/runtime/moonbeam/tests/integration_test.rs	99.40% (+0.03%)	🔼
/runtime/moonriver/tests/integration_test.rs	99.38% (+0.03%)	🔼

Coverage generated Sat Jun 29 02:18:47 UTC 2024