Pallet assets-vesting

[pandres95]

Fixes #4090.

Description

The pallet-assets-vesting is a pallet that supports handling vesting of an instances of pallet-assets through freezing fungibles.

The behaviour is analog to what already exists with pallet-vesting, with small differences (like adding an asset parameter where the AssetId goes on every call). Also, WithdrawalReasons are no longer used, since they're related to Currency.

Integration

This pallet can be integrated into any runtime that already has an instance of pallet-assets and pallet-assets-freezer.

The instance must be the same as the one that pallets mentioned above use.

type AssetsInstance = pallet_assets::Instance1;

#[derive_impl(pallet_assets::config_preludes::ParachainDefaultConfig)]
impl pallet_assets::Config<AssetsInstance> for Test {
	type Currency = Balances;
	type ForceOrigin = EnsureRoot<AccountId>;
	type CreateOrigin = EnsureSigned<AccountId>;
	type Freezer = AssetsFreezer;
}

impl pallet_assets_freezer::Config<AssetsInstance> for Runtime {
	type RuntimeFreezeReason = RuntimeFreezeReason;
	type RuntimeEvent = RuntimeEvent;
}

impl pallet_assets_vesting::Config<AssetsInstance> for Test {
	type RuntimeEvent = RuntimeEvent;
	type ForceOrigin = EnsureRoot<AccountId>;
	type Assets = Assets;
	type Freezer = AssetsFreezer;
	type BlockNumberToBalance = Identity;
	type RuntimeFreezeReason = RuntimeFreezeReason;
	type WeightInfo = ();
	type MinVestedTransfer = MinVestedTransfer;
	type BlockNumberProvider = System;
	const MAX_VESTING_SCHEDULES: u32 = 3;
}

Checklist

• My PR includes a detailed description as outlined in the "Description" and its two subsections above.
• My PR follows the labeling requirements of this project (at minimum one label for T required)
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• I have made corresponding changes to the documentation (if applicable)
• I have added tests that prove my fix is effective or that my feature works (if applicable)