feat: genesis loader

[greged93]

Adds a genesis loader to the starknet pallet, which allows to easily load a genesis from a yaml or json file.

What is the current behavior?

Genesis as to be hardcoded in the chain_spec.rs file from the node. This PR allows users to define their own genesis in a json.

What is the new behavior?

• Load genesis from json/yaml
• Update mocking to load genesis from yaml
• Update ts test for root state (root state diff since an unused value was written to storage)

Does this introduce a breaking change?

Yes

[greged93]

I left both the json and the yaml genesis files in the PR for now, with the goal to decide which one we keep.
JSON is I believe more readable but does not allow comments, which means we either allow a bunch of unspecified hardcoded values (or we keep all these values in constants.rs, prefixed with _). On the other hand, YAML is maybe less readable but allows for comments. Let me know what you think.

[codecov]

Codecov Report

Patch coverage: 91.91% and project coverage change: +1.13% 🎉

Comparison is base (d4db522) 42.04% compared to head (2196fc0) 43.18%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #913      +/-   ##
==========================================
+ Coverage   42.04%   43.18%   +1.13%     
==========================================
  Files          86       87       +1     
  Lines       10741    10669      -72     
  Branches    10741    10669      -72     
==========================================
+ Hits         4516     4607      +91     
+ Misses       5659     5493     -166     
- Partials      566      569       +3     

Files Changed	Coverage Δ
crates/node/src/chain_spec.rs	0.00% <0.00%> (ø)
crates/node/src/main.rs	25.00% <ø> (ø)
crates/pallets/starknet/src/lib.rs	77.16% <ø> (ø)
crates/pallets/starknet/src/genesis_loader.rs	95.78% <95.78%> (ø)

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[EvolveArt]

lgtm

if we could add some scripts to easily compute the storage keys from madara repo directly that'd be really helpful I think (maybe an issue on starkli is better)