implement logic to build genesis state for the sequencer

[rianhughes]

This PR implements the genesis pkg that builds a state diff from declaring classes, deploying contracts and invoking functions. The sequencer can then commit this state diff to state, so that upon startup, a set of account contracts have already been deployed and funded (it is not possible to achieve this from an empty state by submitting transactions, since Starknet requires accounts to be funded to perform any actions on the state - originally this wasn't a requirement in Starknet). This is particularly useful as it allows users to start the sequencer with any number of accounts pre-deployed, and pre-funded, etc, and opens up the possibility of using Juno as a devnet

In essence:

1. we load classes, then declare them,
2. execute the constructor functions using the vm, which writes the changes to the pending state
3. execute any functions of interest (eg token transfers) using the vm (where similarly the vm writes the changes to the pending state)
4. extract the state-diff and new classes from the pending state.

[codecov]

Codecov Report

Attention: Patch coverage is 65.54054% with 102 lines in your changes missing coverage. Please review.

Project coverage is 74.52%. Comparing base (21f442f) to head (41bd928).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
genesis/genesis.go	65.14%	42 Missing and 19 partials ⚠️
adapters/vm2core/vm2core.go	55.00%	14 Missing and 4 partials ⚠️
sync/pending.go	70.58%	13 Missing and 2 partials ⚠️
core/state_update.go	73.91%	5 Missing and 1 partial ⚠️
node/throttled_vm.go	60.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2371      +/-   ##
==========================================
- Coverage   74.74%   74.52%   -0.23%     
==========================================
  Files         111      112       +1     
  Lines       12581    12871     +290     
==========================================
+ Hits         9404     9592     +188     
- Misses       2480     2554      +74     
- Partials      697      725      +28     

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[AnkushinDaniil]

I have finished reviewing everything except vm logic. Everything is good, just small changes and questions. I'll continue reviewing vm logic.

[cicr99]

Even though the PR is approved, I'm adding the blocked label up until all the changes regarding the new blockifier release are finished. This takes priority and will probably cause conflicts with the changes done to the vm pkg in this PR.