Feature: PRO-2373 migrate ethers to viem

[kanthgithub]

Migrate etherspot-modular-sdk from ethers to viem

Description

• viem dependency added to package.json
• ModularSDK, EtherSpotWalletAPI and dependant typescript classes are refactored to
  • use viem account, PublicClient, WalletClient
  • remove references and injection of privateKey to SDK initialisation
  • create custom types for BigNumber, UserOpsStructs
  • remove typechain references of the etherspot-module-contracts
  • add ABI constants for all functions of modular-contracts being used in SDK

Manual Testing

Test Strategy:
Key functions of the Modular Smartcontracts:

1. getCounterFactualAddress
2. install module
3. list modules
4. uninstall modules
5. native and erc20 transfer via UserOps to a recipient
6. Smart Wallet creation for a new EOA account

Example scripts in the directory: are used to test above set of scenarios
The SDK function path will cove most of the migrated set of functions while testing above list of scenarios

Test Networks

Scenarios are tested on Sepolia and Amoy

Test Proofs

Types of changes

• New feature (non-breaking change which adds functionality)
• Documentation Update
• Code style update (formatting, renaming)
• Refactoring
• Build related changes

[linear]

PRO-2373 Replace Ethers with Viem in Modular SDK