✨ Add when to ContributionInfo (#330)

## What?
- Add `when` to `ContributionInfo`

## Why?
So the UI can easily know when the contribution was made and display it

## How?
add the field to the type, and assign it to `now` inside `do_contribute`

## Testing?
Run normal tests, since this new field shouldn't affect the logic

pallets/funding/src/functions/4_contribution.rs

@@ -317,6 +317,7 @@ impl<T: Config> Pallet<T> {
 			funding_asset,
 			funding_asset_amount,
 			plmc_bond,
+			when: now,
 		};
 
 		// Try adding the new contribution to the system

pallets/funding/src/lib.rs

@@ -177,7 +177,8 @@ pub type EvaluationInfoOf<T> = EvaluationInfo<u32, Did, ProjectId, AccountIdOf<T
 pub type BidInfoOf<T> =
 	BidInfo<ProjectId, Did, BalanceOf<T>, PriceOf<T>, AccountIdOf<T>, BlockNumberFor<T>, MultiplierOf<T>>;
 
-pub type ContributionInfoOf<T> = ContributionInfo<u32, Did, ProjectId, AccountIdOf<T>, BalanceOf<T>, MultiplierOf<T>>;
+pub type ContributionInfoOf<T> =
+	ContributionInfo<u32, Did, ProjectId, AccountIdOf<T>, BalanceOf<T>, BlockNumberFor<T>, MultiplierOf<T>>;
 
 pub type BucketOf<T> = Bucket<BalanceOf<T>, PriceOf<T>>;
 pub type WeightInfoOf<T> = <T as Config>::WeightInfo;

pallets/funding/src/types.rs

@@ -413,7 +413,7 @@ pub mod storage_types {
 	}
 
 	#[derive(Clone, Encode, Decode, Eq, PartialEq, RuntimeDebug, MaxEncodedLen, TypeInfo)]
-	pub struct ContributionInfo<Id, Did, ProjectId, AccountId, Balance, Multiplier> {
+	pub struct ContributionInfo<Id, Did, ProjectId, AccountId, Balance, BlockNumber, Multiplier> {
 		pub id: Id,
 		pub did: Did,
 		pub project_id: ProjectId,
@@ -424,6 +424,7 @@ pub mod storage_types {
 		pub funding_asset: AcceptedFundingAsset,
 		pub funding_asset_amount: Balance,
 		pub plmc_bond: Balance,
+		pub when: BlockNumber,
 	}
 
 	/// Represents a bucket that holds a specific amount of tokens at a given price.