refactor(mempool): remove AccountNonce struct

[ayeletstarkware]

Part of a larger refactor.
Starting point:
Two separate structs:

• AccountState (contains a nonce field)
• Account (contains sender_address and AccountState)

Target:
Merge into one struct, AccountState, containing two fields: sender_address and account_nonce.

Current state:

• AccountState (contains sender_address and nonce)

Please start by reviewing the mempool_types.rs file first.

Stack of PRs:

1. refactor(mempool): rename account state to account nonce refactor(mempool): rename account state to account nonce #957
2. refactor(mempool): rename account to account state refactor(mempool): rename account to account state #959
3. refactor(mempool): merge AccountNonce into AccountState refactor(mempool): merge AccountNonce into AccountState #963
4. refactor(mempool): remove AccountNonce struct refactor(mempool): remove AccountNonce struct #965 <-- you're here

---

This change is 

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 15.01%. Comparing base (d50eda9) to head (8e86f4a).

Additional details and impacted files

@@                                                Coverage Diff                                                @@
##           ayelet/mempool/account-state-refactor/merge-account-nonce-into-account-state     #965       +/-   ##
=================================================================================================================
- Coverage                                                                         28.29%   15.01%   -13.29%     
=================================================================================================================
  Files                                                                               119       34       -85     
  Lines                                                                             12440     2758     -9682     
  Branches                                                                          12440     2758     -9682     
=================================================================================================================
- Hits                                                                               3520      414     -3106     
+ Misses                                                                             8673     2326     -6347     
+ Partials                                                                            247       18      -229     

Flag	Coverage Δ
	15.01% <100.00%> (-13.29%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.