feat(examples): add {p,r}/demo/tamagotchi

[moul]

This is an example that extensively utilizes timestamps to mimic ticks.

The render function could perform an in-memory update to simulate a consistently current state before it displays anything. The actual update, however, takes place during transactions.

Additionally, the tamagotchi object can be designed for safety, allowing its pointer to be managed in a permissionless manner.

To simplify and reduce confusion, I placed everything in the realm. However, in reality, Tamagotchi.gno could function as a standalone package that allows the creation of various tamagotchis from other realms or even different tamagotchi families.

I created this example to showcase timing constraints without relying on DeFi. In practice, this simple example could be enhanced by using an interface and incorporating additional Tamagotchi<>Tamagotchi actions such as breeding, cloning, and so on. Nevertheless, it might be preferable to keep this example simple for now, while we can imagine implementing these improvements in separate contracts.

Please note that the testing is not extensive because we currently do not have a method to modify timestamps during unit tests. You can refer to the following link for more information: GitHub Issue #1165.

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Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (902e678) 55.94% compared to head (f6c9bf5) 56.36%.
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- Partials     2863     2887      +24     

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[thehowl]

Do you also want to just move the package to p/demo/tamagotchi in this PR?

[moul]

Do you also want to just move the package to p/demo/tamagotchi in this PR?

What do you prefer for the realm:

1. I can keep it as it is, mixing "p" and "r" in "r".
2. I can split it and create "p/demo/tamagotchi", but I'm not sure if anyone will use it before it becomes an interface.
3. I can move it to "p/" and use the feat: add r/demo/showcase #898 realm for the demo on the realm's side.

Which option do you prefer?

[thehowl]

I can split it and create "p/demo/tamagotchi", but I'm not sure if anyone will use it before it becomes an interface.

I think it can be a useful thing to play around with.

Together with the personal realms that you introduced in #1138 (on my review-list as well), we can encourage users to play around on their local installations to make "home pages"; and as such make tamagotchis another fun tool that a user can simply add to their personal realm, even if just playing around with gno locally on their machine.

I'm not sure what you mean by making it an interface; I think it can be decently useful without "genericising" it :)

[moul]

split done.

next steps:

• include it in r/manfred/home -> will wait for feat: introduce personal realms, add r/manfred/home #1138 to be merged.
• add os_test.Sleep

---

Edit: good for me for a new review.

[thehowl]

good after changes ✔️