implement swap assets button

[Sharqiewicz]

What:

As a user i should be able to reverse the direction of swap on the Forex AMM swap UI

How:

✅ Implement Swap Assets Button (swaps assets and amount)

Closes: #466

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[vadaynujra]

Tested the feature. Video link. Observations:

• There is now an option to interchange the assets - expected
• Direction changes (pointing up or down) for each click - expected
• Amount also changes along with the interchange of assets - expected

Ready to be merged.