minimal p/ownable Interface with multiple implementations

[moul]

Propose refactoring p/ownable from a struct with a specific implementation to a more minimal interface, allowing for custom ownership logic while retaining the current struct as the default implementation.

Details

• Minimal Interface: Define a minimal interface, possibly just Owner() std.Address. Enabling read-only usage of Ownable everywhere with the possibility of custom ownership logic.
• Default Implementation: Retain the current struct as the default implementation.
• Extended Interface: Keep the current helpers (e.g., Transfer) in another interface, like Transferrable which embeds Ownable.

cc @leohhhn

[linhpn99]

I think I understand this issue. If permitted, can I create a pull request to resolve it?

[linhpn99]

#2198
hey @moul @leohhhn I have implemented the PR for this issue. Can you take a look and provide any feedback? Do we need to add a custom implementation ?