chore: make tx_hash member private

[ArniStarkware]

This change is 

[ArniStarkware]

• chore: make tx_hash member private #410 👈
• chore: streamline tx_hash getter method #399
• chore: small refactor invoke account transaction #398
• chore: small refactor declare account transaction #397
• chore: small refactor deploy_account #396
• main

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[MohammadNassar1]

Reviewed 1 of 1 files at r1, all commit messages.
Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @ArniStarkware)

a discussion (no related file):
Why does tx_hash need to be private while others aren't?

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[github-actions]

Benchmark movements:
tree_computation_flow performance improved 😺
tree_computation_flow time: [65.703 ms 66.206 ms 66.964 ms]
change: [-8.0369% -4.7223% -1.8845%] (p = 0.00 < 0.05)
Performance has improved.
Found 7 outliers among 100 measurements (7.00%)
3 (3.00%) high mild
4 (4.00%) high severe

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

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Additional details and impacted files

@@                 Coverage Diff                  @@
##             graphite-base/410     #410   +/-   ##
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  Coverage                     ?   76.61%           
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  Files                        ?      344           
  Lines                        ?    36193           
  Branches                     ?    36193           
====================================================
  Hits                         ?    27731           
  Misses                       ?     6161           
  Partials                     ?     2301           

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[ArniStarkware]

There is no need for this PR.