Incomplete Cleanup for LockedTokens in prune_market

[hman38705]

Description
The prune_market function (Line 243) explicitly removes the DataKey::Market(market_id) record. However, it completely ignores other data structures associated with that market, such as DataKey::LockedTokens(market_id, ...) and DataKey::VoteTally(market_id, ...). This leaves zombie data in the ledger that can never be reached, leading to state expansion.

Requirements and context

• Ensure all related storage keys are cleared during market pruning.
• Provide a mechanism to iterate and remove voter-specific data.

Suggested execution

• Fork the repo and create a branch: git checkout -b fix/issue-84-deep-pruning
• Refactor the pruning logic.

Implementation changes

• Update markets.rs (around line 262) to include deletions for associated voting and locking keys.

Test and commit

• Verify that the total storage footprint for a market drops to zero after pruning.

Example commit message
fix: implement deep pruning to clear all associated market state records

Guidelines

• State hygiene.
• Timeframe: 48 hours.

[Mkalbani]

@Mkalbani has applied to work on this issue as part of the Stellar Wave Program's 3rd wave.

Hi maintainers, can I work on this. I've worked on a similar work. Thank you.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Mkalbani to this issue.