chore(blockifier): make the utility felt_to_u128 private

[ArniStarkware]

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[reviewable-StarkWare]

This change is 

[ArniStarkware]

• chore(blockifier): share the utility felt_to_u128 to starknet api #2093
• chore(blockifier): make the utility felt_to_u128 private #2095 👈 (View in Graphite)
• main

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[github-actions]

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[ArniStarkware]

This PR is a simplified version of #2093. It solves a few issues I had, hopefully in the path of least resistance.

Reviewable status: 0 of 4 files reviewed, all discussions resolved (waiting on @barak-b-starkware, @dorimedini-starkware, and @noaov1)

[codecov]

Codecov Report

Attention: Patch coverage is 40.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 77.27%. Comparing base (e3165c4) to head (f6891af).
Report is 416 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/starknet_api/src/core.rs	0.00%	1 Missing and 2 partials ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #2095       +/-   ##
===========================================
+ Coverage   40.10%   77.27%   +37.17%     
===========================================
  Files          26      105       +79     
  Lines        1895    13766    +11871     
  Branches     1895    13766    +11871     
===========================================
+ Hits          760    10638     +9878     
- Misses       1100     2669     +1569     
- Partials       35      459      +424     

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[dorimedini-starkware]

Reviewed 4 of 4 files at r1, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @barak-b-starkware and @noaov1)

[github-actions]

Artifacts upload triggered. View details here