Implemented factory and address calculation

[Samuel1-ona]

So I figured out that when I was performing the calculation of the addresses, i was hashing it manually, which is not possible on Soroban. Therefore, what i did was to use
The Soroban SDK's deployer.with_current_contract(salt).deployed_address() this method``

• Uses the same internal logic as deploy_v2() to calculate the deterministic address
• Takes into account the deployer's address (current contract) + salt + WASM hash
• Returns the exact address that would be deployed without actually deploying

And this method is "counterfactual deployment" pattern in Soroban use for calculating addresses

Closes #2

[manoahLinks]

Thanks for your great detailed work, having a deterministics address is part of our architecture. emails will be used as salt