feat: add Fantom support

[z80dev]

Alchemy supports Fantom now

What I did

Added support for Fantom mainnet and testnet

How I did it

Added Fantom opera and testnet to the list of supported networks

Added Fantom url format strings

Added logic for replacing "opera" with "mainnet" when formatting the URL

How to verify it

ape console --network fantom:mainnet:alchemy

Checklist

• [X] Passes all linting checks (pre-commit and CI jobs)
• [X] New test cases have been added and are passing
• [X] Documentation has been updated
• [X] PR title follows Conventional Commit standard (will be automatically included in the changelog)