[feat]: Add Chain ID verification against RPC

[ajimeno04]

This pull request introduces a new method to validate the Chain ID obtained from a given RPC endpoint against an expected Chain ID. The aim is to ensure that the application is connected to the correct blockchain network.

[jsanmigimeno]

This code is not correct, there are 2 main issues:

• The result of the validateChainIdFromRPC() function is used in an incorrect way: if it returns true (i.e. the chainId is valid) an error is thrown.
• validateChainIdFromRPC() is an async function, yet you are not awaiting the result. As a matter of fact, you cannot await the result where the function is called, since the loadChainsConfig() function is not an async one. You're going to have to explore at which other point you can make the async call, or how you can modify the current code to accommodate for it.