feat: add emit event to receiveDonation function

[NueloSE]

Pull Request

• Closes [feat] Emit event when fund receives a donation #138
  Open

• Added tests (if necessary)

• Run tests

• Run formatting

• Commented the code

Changes description

• Add emit event to receiveDonation function
• create a new struct

    #[derive(Drop, starknet::Event)]
    pub struct DonationReceived {
        #[key]
        pub donor_address: ContractAddress,
        pub donated_strks: u256,
        pub current_balance: u256,
        pub fund_contract_address: ContractAddress,
    }

• Update Event

enum Event {
        DonationWithdraw: DonationWithdraw,
        NewVoteReceived: NewVoteReceived,
        DonationReceived: DonationReceived,
    }
    ```

## Current output

Give evidence like screenshots of what your job looks like.

## Time spent breakdown

< 5hrs

## Comments

formatted using `scarb fmt`

[EmmanuelAR]

Exc work @NueloSE just some changes!

[EmmanuelAR]

LGTM

[EmmanuelAR]

Also change the event, please run the scarb build and fmt

[NueloSE]

@EmmanuelAR fixed the typo now