implement shadow feature for juno sequencer

[rianhughes]

closes #2015

Just creating a fresh branch with all commits from PR 2015 squashed into one, to make reviewing easier.

This PR builds on top of the rianhughes/merge-sequnecer PR. It implements a new "shadow" mode for the Juno sequencer feature. This "shadow" mode pulls blocks from the FGW, re-executes them, builds the corresponding state-update (etc), and applies it to the local blockchain if the verification checks pass.

Running make sequencer-shadow-sepolia with a snapshot from a 0.13.2 block, will allow it to "sync" the Sepolia network by re-executing every block, and only storing it if the verification checks pass. Currently, this is running fine from block ~120,000 to block ~190,000 (still syncing at the time of writing), without any issues.

The main logic is contained in the runSequencer() function in the builder package. There are some helper functions that really aid in debugging (eg CompareReceipts(), the Print() methods on some of the methods), which I've left in.

[codecov]

Codecov Report

Attention: Patch coverage is 46.00117% with 925 lines in your changes missing coverage. Please review.

Project coverage is 72.10%. Comparing base (0d02f9e) to head (392d5aa).

Files with missing lines	Patch %	Lines
builder/builder.go	54.36%	203 Missing and 48 partials ⚠️
blockchain/blockchain.go	38.39%	97 Missing and 41 partials ⚠️
core/receipt.go	1.57%	125 Missing ⚠️
core/printers.go	0.00%	88 Missing ⚠️
core/state_update.go	40.28%	74 Missing and 9 partials ⚠️
genesis/genesis.go	55.81%	39 Missing and 18 partials ⚠️
mempool/mempool.go	63.76%	35 Missing and 15 partials ⚠️
adapters/vm2core/vm2core.go	59.30%	34 Missing and 1 partial ⚠️
node/node.go	51.38%	29 Missing and 6 partials ⚠️
node/genesis.go	0.00%	23 Missing ⚠️
... and 7 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2173      +/-   ##
==========================================
- Coverage   76.25%   72.10%   -4.15%     
==========================================
  Files         104      111       +7     
  Lines       11200    12818    +1618     
==========================================
+ Hits         8540     9242     +702     
- Misses       2012     2783     +771     
- Partials      648      793     +145     

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