Add firstclass support for idiazabalnet to Umami

Summary

The idiazabalnet testnet is now up and running. This net has many changes, including tenderbake. We (Wallet & Library development teams) should promote engagement with the Tezos development ecosystem so that we have more miles and eyes on this significant protocol update.

Please add support for idiazabalnet to Umami so that developers can easily develop and test against this new test network.

More info on this network is available here: https://teztnets.xyz/idiazabalnet-about Public RPC nodes are available here: https://idiazabalnet.ecadinfra.com/

Related issues:

• Beacon: https://github.com/airgap-it/beacon-sdk/issues/294 (shipped in v2.3.7)
• Taquito: https://github.com/ecadlabs/taquito/issues/1162