Switch to ethereum-rlp

[SamWilsn]

What was wrong?

Circular dependency between tests and EELS.

How was it fixed?

Splitting out the RLP code into its own library.

Cute Animal Picture

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 75.64259% with 199 lines in your changes missing coverage. Please review.

Project coverage is 83.56%. Comparing base (da1e112) to head (0ffff6c).
Report is 57 commits behind head on master.

Files with missing lines	Patch %	Lines
src/ethereum/arrow_glacier/transactions.py	21.15%	41 Missing ⚠️
src/ethereum/gray_glacier/transactions.py	21.15%	41 Missing ⚠️
src/ethereum/muir_glacier/transactions.py	26.31%	28 Missing ⚠️
src/ethereum/dao_fork/transactions.py	27.27%	24 Missing ⚠️
src/ethereum/paris/transactions.py	82.69%	9 Missing ⚠️
src/ethereum/arrow_glacier/fork.py	33.33%	4 Missing ⚠️
src/ethereum/byzantium/transactions.py	89.47%	4 Missing ⚠️
src/ethereum/constantinople/transactions.py	89.47%	4 Missing ⚠️
src/ethereum/dao_fork/fork.py	33.33%	4 Missing ⚠️
src/ethereum/frontier/transactions.py	86.66%	4 Missing ⚠️
... and 11 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1034      +/-   ##
==========================================
- Coverage   83.59%   83.56%   -0.04%     
==========================================
  Files         644      649       +5     
  Lines       36123    35976     -147     
==========================================
- Hits        30198    30063     -135     
+ Misses       5925     5913      -12     

Flag	Coverage Δ
unittests	83.56% <75.64%> (-0.04%)	⬇️

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