refactor `config.py`

[PatrickAlphaC]

RIght now, it's a beeegggggg file. It would be great to split up those classes into 3 separate files.

[s3bc40]

I can try to refactor this file

[PatrickAlphaC]

It might not be worth it tbh. If you want to, go for it, but there are more important things to work on too!

[s3bc40]

Well, I have made a PR after trying a lot of things, but I was not doing it the right way... I was trying to solve everything at the same time and went back to the start.

So for now I have made a simple rework just to propose a "simple solution". I'll let that to other contributors or future improvements. It can maybe help to start something!

I'll be checking other issues later, I should get back to the course!

EDIT: I have asked in the PR, but maybe it is better here. I would like to test it with the integration workflow. Do we set up the keys inside a .env?

1. `ETHERSCAN_API_KEY` set to an Etherscan API key
2. `OPTIMISTIC_ETHERSCAN_API_KEY` set to an Etherscan-Optimism API key

[PatrickAlphaC]

Do we set up the keys inside a .env?

That is one option. What you'd do, is you'd add everything into a .env, and then run source .env to active them.

Optionally, you could also just directly activate them in your shell. For extra security, you could encrypt them with a CLI password manager like pass, encrypt them, and then run a script to activate them in your shell.

This might be overkill for these API keys, as they don't have access to much.