Pallet/Tangram: Drop membership NFT for being member of an organisation

[5-mark]

User Story

As gamedao protocol I want to reward an organisation membership with an achievement token so that the user feels appreciated.

Acceptance Criteria

1. When becoming a member of an organisation a NFT will be available to the user
   1.1 immutable part: unique, non-transferable, burnable
   1.2 content part: IPFS hash within NFT (CID)
   1.3 user has to claim the NFT
2. When the user leaves the organisation the NFT will be burned

Additional Information

How to test

1. create or join an organisation to become a member
2. find the Claim link
3. receive the token after signing the transaction

[vovacha]

Moved: playzero/zero-network#183