feat: update dependencies to use local paths instead of git sources

[QuantumExplorer]

Issue being fixed or feature implemented

This update changes the dependency management for several packages to use local paths instead of fetching from a remote Git repository.

What was done?

• Updated Cargo.toml files across multiple packages to replace Git dependencies with local paths for dashcore, dash-spv, key-wallet, and key-wallet-manager.
• Removed the Git source URLs for the dashcore library and its related packages.
• Added a new initializer in the Swift Wallet class to manage ownership of FFI wallet handles.

How Has This Been Tested?

The changes have been tested by building the project and running existing unit tests to ensure that the local paths resolve correctly and that functionality remains intact.

Breaking Changes

None

Checklist

• I have performed a self-review of my own code

• I have commented my code, particularly in hard-to-understand areas

• I have added or updated relevant unit/integration/functional/e2e tests

  For repository code-owners and collaborators only

• I have assigned this pull request to a milestone

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch featupdate-dependencies-to-local-paths

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[lklimek]

This breaks way too much stuff when doing a build. We cannot refer do another repos by local path, as it is not guaranteed these are checked out.