Consolidate decoding of `EVM.TransactionExecuted` event for the contained transaction & receipt

Walkthrough

The changes consolidate the decoding process of EVM.TransactionExecuted events in the system. Previously, decoding the transaction and receipt was done separately, causing redundancy. Now, the decodeTransactionEvent function handles both tasks, streamlining the process and improving efficiency. The changes affect multiple files, primarily within the models, adjusting function signatures and import statements accordingly.

Changes

File Path	Change Summary
models/events.go	Updated `Transactions` method to use `decodeTransactionEvent` for combined decoding of transactions and receipts.
models/receipt.go	Removed redundant imports and the `decodeReceipt` function related to receipt decoding.
models/transaction.go	Refactored `decodeTransaction` to `decodeTransactionEvent`, updating the decoding logic and error handling.
models/receipt_test.go	Updated tests to reflect the new return values of `decodeTransactionEvent`.
models/transaction_test.go	Modified test functions to accommodate changes in `decodeTransactionEvent` return values.

Sequence Diagram(s)

sequenceDiagram
    participant C as CadenceEvents
    participant D as Decoder
    participant T as Transaction
    participant R as StorageReceipt

    C->>D: Transactions()
    loop for each event
        D->>D: decodeTransactionEvent(e.Value)
        D->>C: Transaction, Receipt
        C->>T: Add Transaction
        C->>R: Add Receipt
    end

Assessment against linked issues

Objective	Addressed	Explanation
Consolidate decoding of transaction and receipt from `EVM.TransactionExecuted` event (#349)	✅

Poem

In the code where data flows, Decoding twice now overthrows, With decodeTransactionEvent in place, We've streamlined logic, saved some space. Transactions and receipts in one go, Efficiency and clarity, watch them grow! 🌟

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onflow / flow-evm-gateway