feat: added ContractScanner service class to handle fetching contracts from mirror node

[quiet-node]

Description:
This PR introduces the fetchContracts() and fetchContractByteCode() methods to facilitate the retrieval of contracts from the mirror node. Additionally, it includes test coverage for the associated methods.

Related issue(s):

Fixes #1038

Notes for reviewer:

Checklist

• Documented (Code comments, README, etc.)
• Tested (unit, integration, etc.)

[github-actions]

Test Results

 16 files  ±0   83 suites  +2   12m 24s ⏱️ +21s
294 tests +5  288 ✅ + 9  6 💤 ±0  0 ❌  - 4 
303 runs  +6  296 ✅ +10  7 💤 ±0  0 ❌  - 4 

Results for commit a03d2ab. ± Comparison against base commit 9074fef.

This pull request removes 1 and adds 6 tests. Note that renamed tests count towards both.

"before all" hook in "HIP583 Test Suite - Ethereum Transfer TX via system-contracts" ‑ HIP583 Test Suite - Ethereum Transfer TX via system-contracts "before all" hook in "HIP583 Test Suite - Ethereum Transfer TX via system-contracts"

should test that can make fungible token transfer via system-contracts from hollow account to another ‑ HIP583 Test Suite - Ethereum Transfer TX via system-contracts Fungible Token Test should test that can make fungible token transfer via system-contracts from hollow account to another
should test that can make non-fungible token transfer via system-contracts from hollow account to another ‑ HIP583 Test Suite - Ethereum Transfer TX via system-contracts Non-Fungible Token Test should test that can make non-fungible token transfer via system-contracts from hollow account to another
should test that hollow account is created and the amount of fungible tokens is correctly transferred via system-contracts ‑ HIP583 Test Suite - Ethereum Transfer TX via system-contracts Fungible Token Test should test that hollow account is created and the amount of fungible tokens is correctly transferred via system-contracts
should test that hollow account is created and the amount of non-fungible tokens is correctly transferred via system-contracts ‑ HIP583 Test Suite - Ethereum Transfer TX via system-contracts Non-Fungible Token Test should test that hollow account is created and the amount of non-fungible tokens is correctly transferred via system-contracts
should test that second transfer fungible tokens via system-contracts to the hollow account is successful ‑ HIP583 Test Suite - Ethereum Transfer TX via system-contracts Fungible Token Test should test that second transfer fungible tokens via system-contracts to the hollow account is successful
should test that second transfer non-fungible tokens via system-contracts to the hollow account is successful ‑ HIP583 Test Suite - Ethereum Transfer TX via system-contracts Non-Fungible Token Test should test that second transfer non-fungible tokens via system-contracts to the hollow account is successful

♻️ This comment has been updated with latest results.

[natanasow]

LGTM, 2 nits 🚀 .

[quiet-node]

Will update and remove HEDERA_NETWORK env variable in future PR.