feat(storage): add db table iterator

[Yael-Starkware]

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• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no API changes)
• Build-related changes
• Documentation content changes
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What is the current behavior?

Issue Number: N/A

What is the new behavior?

Does this introduce a breaking change?

• Yes
• No

Other information

---

This change is 

[codecov]

Codecov Report

Merging #1235 (b3248cf) into main (f711cec) will decrease coverage by 0.20%.
Report is 3 commits behind head on main.
The diff coverage is 66.52%.

@@            Coverage Diff             @@
##             main    #1235      +/-   ##
==========================================
- Coverage   72.04%   71.84%   -0.20%     
==========================================
  Files          78       80       +2     
  Lines        7622     7810     +188     
  Branches     7622     7810     +188     
==========================================
+ Hits         5491     5611     +120     
- Misses       1254     1300      +46     
- Partials      877      899      +22     

Files	Coverage Δ
crates/papyrus_storage/src/db/mod.rs	83.00% <100.00%> (+0.61%)	⬆️
crates/papyrus_storage/src/lib.rs	59.20% <ø> (ø)
crates/papyrus_storage/src/serializers.rs	84.25% <100.00%> (+0.04%)	⬆️
crates/starknet_client/src/reader/objects/block.rs	87.50% <85.71%> (-0.26%)	⬇️
crates/papyrus_common/src/block_hash.rs	84.74% <89.09%> (+1.56%)	⬆️
crates/papyrus_sync/src/lib.rs	70.40% <72.72%> (+0.63%)	⬆️
crates/papyrus_node/src/main.rs	2.40% <0.00%> (-0.41%)	⬇️
crates/papyrus_sync/src/sources/pending.rs	20.83% <20.83%> (ø)
crates/papyrus_storage/src/mmap_file/mod.rs	67.44% <67.44%> (ø)

... and 1 file with indirect coverage changes

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[OmriEshhar1]

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

---

crates/papyrus_storage/src/db/mod.rs line 383 at r1 (raw file):

}

/// A wrapper around a cursor that allows iterating over a table.

Iterator for iterating over a DB table.

[OmriEshhar1]

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