feat: started working on multihop swaps for v3

[ErikBjare]

Continuing on #110

[codecov]

Codecov Report

Merging #221 (2df147d) into master (e17818c) will decrease coverage by 1.35%.
The diff coverage is 58.06%.

@@            Coverage Diff             @@
##           master     #221      +/-   ##
==========================================
- Coverage   78.31%   76.96%   -1.36%     
==========================================
  Files          10       10              
  Lines         793      829      +36     
==========================================
+ Hits          621      638      +17     
- Misses        172      191      +19     

Impacted Files	Coverage Δ
uniswap/util.py	69.01% <38.88%> (-28.36%)	⬇️
uniswap/uniswap.py	74.15% <84.61%> (+0.44%)	⬆️

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