feat(examples): add {p,r}/n2p5/loci

[n2p5]

loci (package and realm)

This is a realm I've developed as part of a larger project I have in the works. While I have a specific purpose for it, the loci realm is free to be used by anyone who wants to have a mutable data store for placing a byte slice tied to their caller address. This can be useful for pointing to other immutable data.

loci is a single purpose datastore keyed by the caller's address. It has two functions: Set and Get.

loci is plural for locus, which is a central or core place where something is found or from which it originates.

In this case, it's a simple key-value store where an address (the key) can store exactly one value (in the form of a byte slice).

Only the caller can set the value for their address, but anyone can retrieve the value for any address.

[Gno2D2]

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