💸 USDT transaction payments

[JuaniRios]

What?

Allow extrinsic fee payment with AssetHub assets that have a price in the oracle

Why?

Needed for OTM flow

How?

• Add the pallet_asset_tx_payment which is tightly coupled to pallet_transaction_payment.
• It gets the PLMC fee required for an extrinsic, and converts it to the asset from pallet_assets with our own custom logic.

Testing?

In the next PR

Anything Else?

• There already were some existing generic structs that implemented this logic, but they assumed the tip and fee to go to the same place. Since we want the fee to go to the Blockchain Operation Treasury, and the tip to go to the block author, we had to reimplement most logic.

• The original struct was FungiblesAdapter<CON, HC>.
  where CON was the converter and HC the crediting of the fee.
  Our solution copies that, but also implements a third generic, such that the second pays the fee-tip, and the third the fee. For more info check pallet_asset_tx_payment::payment::FungiblesAdapter

[JuaniRios]

• 💥 Switch to MultiLocation in the SignedExtension #406 : 2 dependent PRs (#407 , #408 )
• ✅ New e2e tests #405
• 🧪 Test USDT transaction payment #404
• 💸 USDT transaction payments #403 👈
• 🧪 One Token Model - Pallet Funding Tests #402
• 🤝 One Token Model - Pallet Funding Integration #401
• 1️⃣ One Token Model - New Pallet Proxy Bonding #399
• main

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[JuaniRios]

Merge activity

• Oct 10, 10:08 AM EDT: A user started a stack merge that includes this pull request via Graphite.
• Oct 10, 10:16 AM EDT: Graphite rebased this pull request as part of a merge.
• Oct 10, 10:17 AM EDT: A user merged this pull request with Graphite.