Add Asset Balances to taker asset dropdown on swaps

[HEagle18]

Description

I want to see the balances of assets I have in my account when I select the dropdown on 'swap to'.

Steps to Reproduce

1. Try do a swap with your wallet connected
2. pick your 'from' asset
3. then go to select your 'to' asset from dropdown

Actual result:

Expected result:

See screenshot attached from Matcha.

Reproduces how often:

yes easy to reproduce. Try do a swap with your wallet connected, pick your 'from' asset and then go to select your 'to' asset from dropdown. We would like to see your balances listed beside these assets.

Desktop Brave version:

Android Device details:

• Install type (ARM, x86):
• Device type (Phone, Tablet, Phablet):
• Android version:

Version/Channel Information:

• Can you reproduce this issue with the current release? yes
• Can you reproduce this issue with the beta channel? yes
• Can you reproduce this issue with the nightly channel? yes

Other Additional Information:

• Does the issue resolve itself when disabling Brave Shields? no
• Does the issue resolve itself when disabling Brave Rewards? no
• Is the issue reproducible on the latest version of Chrome? yes

Miscellaneous Information:

[srirambv]

Verified as part of #26632 (comment)