Fix: create wsol account with zero balance when SOL is destination

[ghost]

Context

• User faced a bug, where they tried to swap tokenA -> SOL but the tx failed. The issue was that the swap method tried to create a wrapped SOL account with a value which happened to be larger than SOL they possessed. This shouldn't have happened. When SOL is the output of a swap (or withdraw for that matter), wrapped SOL account shouldn't be created with an amountIn.

Notes

• Removed amountInU64 from swap
• Removed minTokenAOut_U64 and minTokenBOut_U64 from withdraw
• Added cautionary comments to resolveOrCreateAssociatedTokenAddress

Tests

• Reproduced the issue with STEP-SOL swap, because they have the same decimals (i.e. 9).
• Confirmed fix with this change.
• Same for withdraw. Saw the issue with STEP-SOL withdraw, and confirmed the this PR fixes it.

[rawfalafel]

Looks good! Let me know when you've tested this, and we'll merge :)

[ghost]

@rawfalafel - Just finished testing this code. Reproduced the issue with previous code, and confirmed that both swap and withdraw are fixed by this PR.