feat(frontend): Use Network wallets for Onramper Widget

[AntonioVentilii-DFINITY]

Motivation

As Security review suggested, it is better to use the param networkWallets of Onramper instead of wallets, to reduce the link length and make it more scalable.

Currently the same wallet addresses for each individual token are specified in the onramper wallets URL parameter, e.g.: https://buy.onramper.dev/?wallets=icp_icp:9dd073a8b088ce77f7e0362d8a3b51752f20c304eb019fc83feb4511d1fa914e,eth:0x0a12ef5b74541C7De3c36B9f0265902869741b6A,usdc_ethereum:0x0a12ef5b74541C7De3c36B9f0265902869741b6A,link_ethereum:0x0a12ef5b74541C7De3c36B9f0265902869741b6A,... IIUC: if wallet addresses are the same for a network these could be specified in networkWallets like this https://buy.onramper.dev/?wallets=icp_icp:9dd073a8b088ce77f7e0362d8a3b51752f20c304eb019fc83feb4511d1fa914e&networkWallets=ethereum:0x0a12ef5b74541C7De3c36B9f0265902869741b6A... Doing this is highly recommended because otherwise you could run into issues with the URL length if more tokens get added over time

Changes

• Create mapping util to link each network from Oisy to a networkWallet for Onramper (plus tests).
• Include networkWallets among the parameters to build the source link.
• Add the list of network (and mapping to address) to the Onramper Widget, removing the list of crypto wallets.

Note

I would like to leave the old utils and parameters there, just in case. But it can be discussed.

Tests

Manual test in local replica worked as usual.

GIX-3110