Develop new Avalanche root gauge for new LZ bridge

[jubeira]

BAL has a new address in Avalanche, and will now be bridged using LZ infrastructure.

Info:

• BALProxy (ethereum): 0xE15bCB9E0EA69e6aB9FA080c4c4A5632896298C3
• BAL (avalanche): 0xE15bCB9E0EA69e6aB9FA080c4c4A5632896298C3

The steps to bridge from mainnet are the following:

1. approve 0xE15bCB9E0EA69e6aB9FA080c4c4A5632896298C3 to spend the quantity to be bridged
2. Call sendFrom on 0xE15bCB9E0EA69e6aB9FA080c4c4A5632896298C3

This should be done by Avalanche's root gauge; we won't be using the current bridge anymore.

[jubeira]

Update: here's a transfer of test BAL from Sepolia to Goerli-Optimism: https://testnet.layerzeroscan.com/10161/address/0x1702067424096f07a60e62ccee3de9420068492d/message/10132/address/0xe39b5e3b6d74016b2f6a9673d7d7493b6df549d5/nonce/2.

The sender / receiver contracts in Sepolia and Goerli OPT are the same ones used in ETH / AVAX respectively.
Then, the gauge should do the same as the TX.

Some notes:

• The address is sent as bytes32.
• The transfer requires some eth to work, which has to be queried beforehand.