Feature: Account Handler

[1yam]

Description:

This PR introduces a new configuration file chains_config.json and updates the _load_account function to handle Solana accounts. These changes simplify the process of importing wallets for Solana users.

Changes:

Added: Support for Solana accounts in the _load_account function.
Created: chains_config.json for chain-specific configurations.
chains_config.json Format:
Added: Helper functions to streamline wallet importation and account management

json

{
   "path": "path",
   "chain": "chain"
}

[nesitor]

There are a lot of things to change and improve, let's do a pair session to fix all these things.