[EVM] Offchain package - part 1

[ramtinms]

Context:
Offchain package allows off-chain software like (GW) to follow the EVM chain and be able to replay all transactions. It also facilitates running queries (e.g. eth_Call), making the complex internal details hidden from the user.

This PR

• makes small changes without any logic change, mostly preparing the stage for the following PRs.
• adds Blocks supporting a storage-based blocks data provider, used later in the package, this removes the need to expose a secondary interface, when re-executing transactions.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 64.46281% with 43 lines in your changes missing coverage. Please review.

Project coverage is 41.28%. Comparing base (3ba181e) to head (efcae1c).

Files with missing lines	Patch %	Lines
fvm/evm/types/result.go	0.00%	27 Missing ⚠️
fvm/evm/offchain/blocks/blocks.go	79.31%	6 Missing and 6 partials ⚠️
fvm/evm/events/events.go	66.66%	1 Missing and 1 partial ⚠️
fvm/evm/offchain/blocks/meta.go	92.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #6544   +/-   ##
=======================================
  Coverage   41.28%   41.28%           
=======================================
  Files        2031     2033    +2     
  Lines      145883   145981   +98     
=======================================
+ Hits        60222    60264   +42     
- Misses      79442    79488   +46     
- Partials     6219     6229   +10     

Flag	Coverage Δ
unittests	41.28% <64.46%> (+<0.01%)	⬆️

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[m-Peter]

LGTM!