[FVM] beyond EVM part 2.1 - adding EVM emulator database

[ramtinms]

The first part of this large PR

[codecov-commenter]

Codecov Report

Attention: 198 lines in your changes are missing coverage. Please review.

Comparison is base (18134c5) 55.77% compared to head (6e37206) 55.75%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4925      +/-   ##
==========================================
- Coverage   55.77%   55.75%   -0.03%     
==========================================
  Files         953      955       +2     
  Lines       88420    88809     +389     
==========================================
+ Hits        49317    49514     +197     
- Misses      35398    35559     +161     
- Partials     3705     3736      +31     

Flag	Coverage Δ
unittests	55.75% <49.61%> (-0.03%)	⬇️

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

Files	Coverage Δ
fvm/evm/types/emulator.go	0.00% <ø> (ø)
storage/pebble/registers.go	86.17% <100.00%> (+2.83%)	⬆️
fvm/evm/types/errors.go	11.76% <0.00%> (+11.76%)	⬆️
fvm/evm/emulator/database/storable.go	40.64% <40.64%> (ø)
fvm/evm/emulator/database/database.go	57.52% <57.52%> (ø)

... and 13 files with indirect coverage changes

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[fxamacker]

Nice work! I left some comments and suggestions related to atree usage.

[fxamacker]

Hey Ramtin, I took another look and left a question (above) about refactor at 164da3d.

[fxamacker]

:D does something like this solve the issue? 0cdbeb8

Yes, thanks! LGTM! 👍