state: Split transaction and block related types of out state.hpp

[chfast]

We are going to hide the State in state.hpp from public. This change moves other types out of this file make the future transition easier to control.

The git history is preserved by using file renames and a lot of merge commits (octopus merge didn't work for me).

[codecov]

Codecov Report

Attention: Patch coverage is 96.29630% with 2 lines in your changes missing coverage. Please review.

Project coverage is 94.21%. Comparing base (bd5dfab) to head (db1a5ef).
Report is 8 commits behind head on master.

Files with missing lines	Patch %	Lines
test/state/transaction.cpp	94.11%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1031   +/-   ##
=======================================
  Coverage   94.21%   94.21%           
=======================================
  Files         149      153    +4     
  Lines       15927    15927           
=======================================
  Hits        15005    15005           
  Misses        922      922           

Flag	Coverage Δ
eof_execution_spec_tests	17.52% <59.61%> (ø)
ethereum_tests	27.33% <96.15%> (ø)
ethereum_tests_silkpre	19.14% <28.84%> (ø)
execution_spec_tests	20.44% <92.30%> (ø)
unittests	89.01% <96.15%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
test/blockchaintest/blockchaintest.hpp	0.00% <ø> (ø)
test/state/block.cpp	100.00% <100.00%> (ø)
test/state/block.hpp	100.00% <100.00%> (ø)
test/state/bloom_filter.cpp	100.00% <ø> (ø)
test/state/host.hpp	100.00% <ø> (ø)
test/state/mpt_hash.cpp	100.00% <ø> (ø)
test/state/state.cpp	100.00% <ø> (+0.76%)	⬆️
test/state/state.hpp	100.00% <ø> (ø)
test/state/system_contracts.cpp	100.00% <ø> (ø)
test/state/transaction.hpp	100.00% <100.00%> (ø)
... and 2 more