chore: add transaction getter to mempool

[Yael-Starkware]

This change is 

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 11 lines in your changes missing coverage. Please review.

Project coverage is 82.65%. Comparing base (4269f5b) to head (aee5b13).
Report is 5 commits behind head on main.

Files	Patch %	Lines
crates/mempool/src/transaction_pool.rs	0.00%	11 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #402      +/-   ##
==========================================
- Coverage   83.24%   82.65%   -0.59%     
==========================================
  Files          36       38       +2     
  Lines        1695     1753      +58     
  Branches     1695     1753      +58     
==========================================
+ Hits         1411     1449      +38     
- Misses        209      229      +20     
  Partials       75       75              

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[elintul]

Reviewed 1 of 1 files at r1, all commit messages.
Reviewable status: all files reviewed, 2 unresolved discussions (waiting on @Yael-Starkware)

---

crates/mempool/src/transaction_pool.rs line 62 at r1 (raw file):

    }

    pub fn get(&self, tx_hash: TransactionHash) -> MempoolResult<&ThinTransaction> {

Suggestion:

get_by_tx_hash

---

crates/mempool/src/transaction_pool.rs line 66 at r1 (raw file):

    }

    pub fn get_by_account(

Suggestion:

get_by_address_and_nonce

[Yael-Starkware]

Reviewable status: 0 of 1 files reviewed, all discussions resolved (waiting on @elintul)

---

crates/mempool/src/transaction_pool.rs line 62 at r1 (raw file):

    }

    pub fn get(&self, tx_hash: TransactionHash) -> MempoolResult<&ThinTransaction> {

done

---

crates/mempool/src/transaction_pool.rs line 66 at r1 (raw file):

    }

    pub fn get_by_account(

done

[elintul]

Reviewed 1 of 1 files at r2, all commit messages.
Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @Yael-Starkware)

a discussion (no related file):
Please change the commit message: "add getter by address and nonce to TransactionPool".

---

[elintul]

Reviewed all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @Yael-Starkware)

[elintul]

Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @Yael-Starkware)