Migrate fee payment from Currency to fungible (#2292)

Part of https://github.com/paritytech/polkadot-sdk/issues/226 
Related https://github.com/paritytech/polkadot-sdk/issues/1833

- Deprecate `CurrencyAdapter` and introduce `FungibleAdapter`
- Deprecate `ToStakingPot` and replace usage with `ResolveTo`
- Required creating a new `StakingPotAccountId` struct that implements
`TypedGet` for the staking pot account ID
- Update parachain common utils `DealWithFees`, `ToAuthor` and
`AssetsToBlockAuthor` implementations to use `fungible`
- Update runtime XCM Weight Traders to use `ResolveTo` instead of
`ToStakingPot`
- Update runtime Transaction Payment pallets to use `FungibleAdapter`
instead of `CurrencyAdapter`
- [x] Blocked by https://github.com/paritytech/polkadot-sdk/pull/1296,
needs the `Unbalanced::decrease_balance` fix

substrate/frame/executive/src/tests.rs

@@ -19,6 +19,7 @@
 
 use super::*;
 
+use pallet_transaction_payment::FungibleAdapter;
 use sp_core::H256;
 use sp_runtime::{
 	generic::{DigestItem, Era},
@@ -40,7 +41,6 @@ use frame_support::{
 };
 use frame_system::{pallet_prelude::*, ChainContext, LastRuntimeUpgrade, LastRuntimeUpgradeInfo};
 use pallet_balances::Call as BalancesCall;
-use pallet_transaction_payment::CurrencyAdapter;
 
 const TEST_KEY: &[u8] = b":test:key:";
 
@@ -338,7 +338,7 @@ parameter_types! {
 }
 impl pallet_transaction_payment::Config for Runtime {
 	type RuntimeEvent = RuntimeEvent;
-	type OnChargeTransaction = CurrencyAdapter<Balances, ()>;
+	type OnChargeTransaction = FungibleAdapter<Balances, ()>;
 	type OperationalFeeMultiplier = ConstU8<5>;
 	type WeightToFee = IdentityFee<Balance>;
 	type LengthToFee = ConstantMultiplier<Balance, TransactionByteFee>;