Total removal of Ethers as a dependency

[victhorbi]

• Replace the encodeEventLog with an alternative implementation #1324*
• Replace hardhat-ethers with hardhat-viem
• Remove ethers from core package and review usage of vechain_sdk_core_ethers #1339
• Check if there's more or if we have better options

*Discussion ongoing here: wevm/viem#2676 (comment)

[victhorbi]

It's important to note that ethers could have runtime checks in place, and viem doesn't.
For example @freemanzMrojo has confirmed that the checks for eip712 are not available.

Make sure that every time a function gets replaced, the runtime checks are available or we should build them.

[freemanzMrojo]

I have opened an issue about the topic mentioned above by @victhorbi : wevm/viem#2999

cc: @fabiorigam @lucanicoladebiasi