Withdrawal from Strategy, Governance Integration Tests, Governance Read Views

[OtowoSamuel]

Closes #220
Closes #221
Closes #226

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Pull Request Description

This PR addresses the following issues in the Nestera protocol smart contracts:

1. Fixed deposit routing to strategies, implemented a strategy registry, and defined a strategy interface.
2. Added withdrawal logic from strategies, including robust handling for underflow, partial, and negative withdrawals.
3. Integrated governance lifecycle tests and attack scenario tests, resolving errors related to trait imports and result handling.
4. Implemented and exposed new governance read-only views for proposals and votes.
5. Ensured all tests pass, including the governance lifecycle test, by updating voting logic to require a majority for proposal queuing.
6. Applied formatting corrections to comply with cargo fmt standards.
7. Addressed all compilation and test errors; only warnings remain (deprecated event publishing and unused code).

The codebase is now error-free, fully tested, and CI-ready.

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