state: Implement `CREATE` address without RLP lib

[chfast]

Remove Host's dependency on RLP library by re-implementing compute_create_address().

Closes https://github.com/ethereum/evmone/issues/783.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 94.23%. Comparing base (b0f6707) to head (d2b9dc2). Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1055   +/-   ##
=======================================
  Coverage   94.23%   94.23%           
=======================================
  Files         155      155           
  Lines       17005    17014    +9     
=======================================
+ Hits        16024    16033    +9     
  Misses        981      981           

Flag	Coverage Δ
eof_execution_spec_tests	17.45% <64.28%> (+0.02%)	:arrow_up:
ethereum_tests	26.92% <92.85%> (+0.03%)	:arrow_up:
ethereum_tests_silkpre	19.04% <90.90%> (+0.04%)	:arrow_up:
execution_spec_tests	20.18% <64.28%> (+0.01%)	:arrow_up:
unittests	89.25% <100.00%> (+<0.01%)	:arrow_up:

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Files with missing lines	Coverage Δ
test/state/host.cpp	100.00% <100.00%> (ø)
test/unittests/state_new_account_address_test.cpp	100.00% <100.00%> (ø)