feat: add aggregate operation count getters for farming-pool, factory, and vesting-wallet

[Joeloo1]

Summary

This PR adds aggregate operation count metrics across FarmingPool, Factory, and VestingWallet contracts to support protocol usage tracking, analytics, governance monitoring, and churn metrics.

Changes Included

1. FarmingPool: Lock Operation Count (Closes No lock operation count getter in FarmingPool #260)

   • Added DataKey::LockCount storage key in farming-pool/src/types.rs.
   • Maintained a running count incremented on every lock_assets invocation (initial locks and top-ups).
   • Exposed lock_count(env: Env) -> Result<u32, PoolError> and get_lock_count(env: Env) -> Result<u32, PoolError>.
   • Added unit test test_lock_count_increments_on_every_lock_operation.

2. Factory: Admin Transfer Count (Closes No admin transfer count getter in Factory #261)

   • Added DataKey::AdminTransferCount storage key in factory/src/types.rs.
   • Maintained a running count incremented on each successful transfer_admin execution.
   • Exposed admin_transfer_count(env: Env) -> Result<u32, FactoryError> and get_admin_transfer_count(env: Env) -> Result<u32, FactoryError>.
   • Added unit test test_admin_transfer_count_increments_on_transfer.

3. FarmingPool: Unstake Operation Count (Closes No unstake operation count getter in FarmingPool #262)

   • Added DataKey::UnstakeCount storage key in farming-pool/src/types.rs.
   • Maintained a running count incremented on each unstake invocation.
   • Exposed unstake_count(env: Env) -> Result<u32, PoolError> and get_unstake_count(env: Env) -> Result<u32, PoolError>.
   • Added unit test test_unstake_count_increments_on_every_unstake_operation.

4. VestingWallet: Release Count (Closes No release count getter in vesting wallet #263)

   • Added DataKey::ReleaseCount storage key in vesting-wallet/src/types.rs.
   • Maintained a running count incremented during release whenever tokens are released to the beneficiary (releasable > 0).
   • Exposed release_count(env: Env) -> Result<u32, VestingError> and get_release_count(env: Env) -> Result<u32, VestingError>.
   • Added unit test test_release_count_increments_on_release.

Testing

All feature unit tests pass:

• cargo test -p farming-pool -- test_lock_count
• cargo test -p factory -- test_admin_transfer_count
• cargo test -p farming-pool -- test_unstake_count
• cargo test -p vesting-wallet -- test_release_count

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