Allow dev accounts to be allocated from the JSON file

[fishseabowl]

This PR allow dev accounts to be allocated from the JSON file
Closes #1496

[kariy]

Hey @fishseabowl thanks for the contribution.

I think we can make this more simpler. We can avoid creating a new struct specifically to differentiate between the account types in the JSON level. Adding a private_key as optional field in GenesisAccountJson struct should be suffice and we can just check if its Some or None and convert it to the appropriate GenesisAccoutAlloc variant in Genesis::TryFrom<GenesisJson>.

The GenesisJson struct is just meant to be a translation layer to build Genesis from the JSON format, so I personally don't think we need types to explicitly define all account variants as long as we're able to define the structure correctly.

[codecov]

Codecov Report

Attention: 588 lines in your changes are missing coverage. Please review.

Comparison is base (374f2bf) 70.06% compared to head (bb2f599) 70.59%.
Report is 24 commits behind head on main.

❗ Current head bb2f599 differs from pull request most recent head 1085dc8. Consider uploading reports for the commit 1085dc8 to get more accurate results

Files	Patch %	Lines
bin/katana/src/main.rs	0.00%	94 Missing ⚠️
crates/katana/runner/src/logs.rs	10.00%	72 Missing ⚠️
bin/saya/src/main.rs	0.00%	56 Missing ⚠️
crates/saya/core/src/lib.rs	0.00%	50 Missing ⚠️
crates/katana/primitives/src/genesis/mod.rs	92.40%	35 Missing ⚠️
bin/saya/src/args/mod.rs	0.00%	33 Missing ⚠️
...es/saya/core/src/data_availability/celestia/mod.rs	0.00%	33 Missing ⚠️
crates/katana/runner/src/prefunded.rs	0.00%	31 Missing ⚠️
bin/saya/src/args/data_availability.rs	0.00%	24 Missing ⚠️
bin/sozo/src/ops/migration/mod.rs	30.30%	23 Missing ⚠️
... and 24 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1515      +/-   ##
==========================================
+ Coverage   70.06%   70.59%   +0.53%     
==========================================
  Files         236      257      +21     
  Lines       22531    24921    +2390     
==========================================
+ Hits        15786    17594    +1808     
- Misses       6745     7327     +582     

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[kariy]

Looks good, nice work. Thanks.