feat: psp22 trait contract example with drink tests

[chungquantin]

Description

Example contract for the fungible use case that applies the PSP22 traits from #297. The PR includes:

• Quasi testing with pop-drink and pop-sandbox: https://github.com/r0gue-io/pop-drink
• Remove all the deprecated example contracts

[Daanvdplas]

Left some improvements. Also, the contract was now incorrect in terms of capabilities, if the token was constructed with existing the contract would not necessarily be able to mint and burn tokens. This is also what we had discussed so I am suprised to still see it in.

[Daanvdplas]

Last nitpicks but then good to go. Not sure whether we need multiple owners to make the contract more safe for a lost owner account but I leave that to the next reviewer to decide. This example has taken us long enough and we should move on, we can always add examples

[al3mart]

The contract gives a nice example on how to use the fungibles api and the tests are pretty cool.

What I have tried and failed to do was deploying this example locally. The contract kept on trapping.

This is what I could see on my logs

2024-11-06 13:38:29.579 DEBUG tokio-runtime-worker runtime::contracts: Execution finished with debug buffer: seal0::input(out_ptr: 69250, out_len_ptr: 65416) = Ok(())
seal0::caller(out_ptr: 69250, out_len_ptr: 65124) = Ok(())
seal0::address(out_ptr: 69250, out_len_ptr: 65124) = Ok(())
seal0::call_chain_extension(id: 194379776, input_ptr: 69250, input_len: 52, output_ptr: 69302, output_len_ptr: 65132) = Ok(133635)
seal0::seal_return(flags: 1, data_ptr: 69250, data_len: 10) = Err(<wasm:stripped>)

[evilrobot-01]

Much better, thank you!

Various typos and fixes suggested. I also think that we need a simple comment on the functions around allowances to make it easier to follow.

[chungquantin]

The gives a nice example on how to use the fungibles api and the tests are pretty cool.

What I have tried and failed to do was deploying this example locally. The contract kept on trapping.

This is what I could see on my logs

2024-11-06 13:38:29.579 DEBUG tokio-runtime-worker runtime::contracts: Execution finished with debug buffer: seal0::input(out_ptr: 69250, out_len_ptr: 65416) = Ok(())
seal0::caller(out_ptr: 69250, out_len_ptr: 65124) = Ok(())
seal0::address(out_ptr: 69250, out_len_ptr: 65124) = Ok(())
seal0::call_chain_extension(id: 194379776, input_ptr: 69250, input_len: 52, output_ptr: 69302, output_len_ptr: 65132) = Ok(133635)
seal0::seal_return(flags: 1, data_ptr: 69250, data_len: 10) = Err(<wasm:stripped>)

I successfully instantiated the contract and mint a new token on testnet: https://polkadot.js.org/apps/?rpc=wss%3A%2F%2Frpc2.paseo.popnetwork.xyz#/explorer/query/0xeb474f72660ef9879f2a3c2f30a28d56b5d250e8945fb8a6c9aa8a0f05cd3947

[al3mart]

Approving as @chungquantin has shown that the issue in my comment might just be something on my side.
👍