feat: add btree_dao to demo

[matijamarjanovic]

WIP

Description

BTree DAO is a little organisation of people who used BTree by @wyhaines. It serves the purpose of demonstrating some of the functionalities like iterating through the list from start and the end, adding nodes and general implementation of the BTree. Besides that, it encourages developers to use BTree and join the DAO.

How it works:

Currently the realm has 2 ways of members joining:

• Either by submiting the BTree instance used in some other realm
• Or by sending a direct transaction using gnokey or Studio Connect having string as argument

Both ways allow members to become a part of the DAO but at different levels: the idea is that if a user decides to submit his own BTree he becomes a true member, and if a user supports the cause and just want to hang around until he gets the hang of the BTree implementation he can do so by joining thorugh a 'seed'. In the realm joining functions are PlantTree and PlantSeed for different roles.
When a member joins he gets minted an NFT made using basic_nft.gno from GRC721 which is like his little proof of membership.

Concearns

To become a 'tree' member developer needs to submit his whole BTree which might be a little unsafe as that BTree might contain some sensitive information. I'd like to do some more reserch in how to bypass having seen the whole BTree but still make sure it exists (sounds like ZK), any help is welcome

Contributors checklist:

• Create a BTree to store all the member info
• Implement Record interface, make nodes' creation times be compared
• Implement DAO joining process for 2 types of members
• Make a Render() function to display member addresses
• Implement a better system for member registration, without them having to share their data
• Think of some benefits to why should someone want to join
• Demonstrate more of BTree functionalities
• Add tests

[Gno2D2]

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