Create custom registry gno.land/r/system/zones for GnoVM chains

[harry-hov]

Issue Description

Using a real domain name like "gno.land" could be risky if they were to lose control of the domain and someone tried to manipulate the dependencies.
(pointed by @ajnavarro)

Potential Solution

Use domain names as channel zones, such as gno.land, manfred.land, etc.

To avoid relying on DNS and name registration, we can create a custom registry at gno.land/r/system/zones for GnoVM chains to register independently.
(suggested by @moul)

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Source: #763 (comment)

[moul]

Let's do this and use this realm as a way to configure ICS too.

[thehowl]

What do we mean by "channel zones"?

How would r/system/zones work? I imagine it would need to have a reasonably high fee to use it as we'd ideally want to avoid the namespace being attacked by spam?