refactor(l2): rewrite integration tests

[ManuelBilbao]

Motivation

L2 tests were broken since two tests were waiting for funds in L2 without depositing.

Description

• Adds test_deposit, test_transfer, test_withdraw, test_deploy, test_call_with_deposit functions that are used by all the tests.
• The deposits and transfers are now done from an L1 rich wallet to a random L2 wallet.
• Adds L1ToL2TransactionData struct to the SDK. This struct contains the current L2 data for privileged transactions.
• Adds send_l1_to_l2_transaction function to the SDK.
• Adds deposit_through_contract_call function to the SDK (wrapper over the above).

[github-actions]

Lines of code report

Total lines added: 94
Total lines removed: 0
Total lines changed: 94

Detailed view

+----------------------------------------------+-------+------+
| File                                         | Lines | Diff |
+----------------------------------------------+-------+------+
| ethrex/crates/l2/sdk/src/l1_to_l2_tx_data.rs | 71    | +71  |
+----------------------------------------------+-------+------+
| ethrex/crates/l2/sdk/src/sdk.rs              | 237   | +23  |
+----------------------------------------------+-------+------+