[Enhancement] XCM - show balances on assets list

[0byt]

From Fritz: Asset transfer/ teleport: Additionally to the available chains that support the selected assets I would like to have the amount I have on each of those already displayed in the dropdown aswell. I feel thats handy if I just quickly want to get funds to my chain of interested I don't have to manually iterate through all of those trying to find the one which has enough balance for me to transfer. Especially with xcm being used more I think assets get split up wide and far so that this feature would allow for some more convenience.