Feat/unagii v2 adapters

[tandn37]

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Created unagii vault v2 asset adapter (erc20) and token adapter v2. Here is list of our vault tokens (also added in migration script):

uUSDCv2: '0x7f75d72886D6A8677321E5602d18948aBCb4281A'; uDAIv2: '0x9ce3018375d305CE3C3303A26eF62D3d2EB8561A'; uUSDTv2: '0x1Eb06EaE3263a35619dC87812a8e7Ec811B59E63'; uWBTCv2: '0xB088D7C71ea9eBAed981c103Fc3019B59950d2C9'; uETHv2: '0x8eF11c51a666C53Aeeec504f120cd1435E451342';