Finish converting core soroban examples to use loam

[chadoh]

Brief Description: With the stabilization of the loam-sdk, our goal is to provide Loam equivalents for each of the main Soroban examples. This initiative aims to help developers understand and leverage the benefits of subcontracts and the Loam toolkit. Additionally, we plan to introduce new example contracts, including NFT and DAO contracts, to further showcase Loam's capabilities.

How to Measure Completion:. Completion will be measured by ensuring all rewritten and new examples are available on GitHub. These examples should be published and ready for deployment using the loam deploy command.

Technical details

@willemneal started re-implementing all stellar/soroban-examples repositories using Loam SDK a long time ago. Currently, most of these examples live in the smartdeploy codebase.

These probably need to be updated to work with the latest Loam & Soroban versions, and they also need to be ported to this repository.

Integration with frontend template

The behavior of stellar contract init recently changed. We should mirror its functionality with loam init, giving people the option of using any of our specific examples (if that's even still a thing anymore; if not then we need to offer/document these as possibilities in some other way).