`TokenVault::initialize` re-init panics with `NotAuthorized` instead of `AlreadyInitialized`

[Jaydbrown]

contracts/token-vault/src/lib.rs initialize: if get_owner(&env).is_some() { panic_with_error!(&env, Error::NotAuthorized); }. Every other contract in the workspace (stream, factory, governor, oracle) uses an AlreadyInitialized error for this. TokenVault::Error doesn't even define AlreadyInitialized. Add it and use it, so callers get a correct error code.

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Filed from a codebase review pass.

[OmniZlatoon]

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