factor in slippage for poolswap calculation

[thedoublejay]

What kind of PR is this?:

/kind fix

What this PR does / why we need it:

Factor in slippage for pool swap to have more accurate results. Updated e2e to check if the poolswap amount is same

Which issue(s) does this PR fixes?:

Fixes #341

Additional comments?:

[codeclimate]

Code Climate has analyzed commit 0790d0c and detected 0 issues on this pull request.

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[codecov]

Codecov Report

Merging #433 (0790d0c) into main (c32eae0) will increase coverage by 0.07%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #433      +/-   ##
==========================================
+ Coverage   87.79%   87.86%   +0.07%     
==========================================
  Files         103      103              
  Lines        1663     1673      +10     
  Branches      269      268       -1     
==========================================
+ Hits         1460     1470      +10     
  Misses        202      202              
  Partials        1        1              

Impacted Files	Coverage Δ
...pNavigator/screens/Dex/PoolSwap/PoolSwapScreen.tsx	95.74% <100.00%> (+0.50%)	⬆️

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Build preview for DeFi Wallet is ready!

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[cypress]

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Test summary

127 • 0 • 0 • 0

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Run details

Project	wallet
Status	Passed
Commit	f8b9bac ℹ️
Started	Aug 5, 2021 9:14 AM
Ended	Aug 5, 2021 9:29 AM
Duration	15:14 💡
OS	Linux Ubuntu - 20.04
Browser	Chrome 92

View run in Cypress Dashboard ➡️

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[canonbrother]

so the ux is following testpoolswap

[fuxingloh]

UX wise we should also display something about slippage and worst-case scenario
U-Zyn

@thedoublejay to create an issue to track the above