feat: add network switcher for starknet wallet

[wa0x6e]

Summary

Closes: #546

This PR adds a network switcher (sn_main <-> sn_sepolia) to argent X wallet (braavos don't support this feature)

How to test

1. Trigger some action requiring starknet signature
2. If your wallet is on the expected network, argent X should show the signature popup (existing behavior)
3. If the wallet is not on the expected network, argent X should show the network switcher popup
4. If REJECTING the switch, it should cancel the signature
5. if APPROVING the switch, it should switch to the correct network, and show the signature popup

Note

• For those using Braavos wallet, the network switcher will be skipped since unsupported, and will directly show the signature popup using the wallet current network (existing behavior)
• If the target network does not exist, argent X will skip the network switcher popup, and just show the signature popup with the wallet existing network (existing behavior)

[bonustrack]

tACK

[Sekhmet]

utACK