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

cumulus/pallets/collator-selection/src/lib.rs

@@ -81,6 +81,8 @@
 
 #![cfg_attr(not(feature = "std"), no_std)]
 
+use core::marker::PhantomData;
+use frame_support::traits::TypedGet;
 pub use pallet::*;
 
 #[cfg(test)]
@@ -981,3 +983,15 @@ pub mod pallet {
 		}
 	}
 }
+
+/// [`TypedGet`] implementaion to get the AccountId of the StakingPot.
+pub struct StakingPotAccountId<R>(PhantomData<R>);
+impl<R> TypedGet for StakingPotAccountId<R>
+where
+	R: crate::Config,
+{
+	type Type = <R as frame_system::Config>::AccountId;
+	fn get() -> Self::Type {
+		<crate::Pallet<R>>::account_id()
+	}
+}