Improve Swap Dropdown

[DavideSegullo]

We should improve swap component UI, because the current implementention doesn't fit well for a lot of assets.

Some suggestions:

1. We can change the dropdown with a dialog
2. We can add a searchbar inside the dialog
3. We can add other info for each assets (Available asset, price ecc.)
4. We can sort by available balances

Some references:

1. Uniswap
2. Astroport

[giannnni]

[DavideSegullo]

Duplicated of #385