Sugar Shack Contract, Test + SDK

[samwise2]

• [x] Sugar Shack example Marketplace smart contract working with compressed NFTs. (See design doc here: https://www.notion.so/solanalabs/Compressed-Marketplace-Design-Doc-d4a4c6394d884d09a3504a34941fe73f)
• [x] sugar-shack-test.js Test suite exercising positive and negative cases for all core instructions: create_or_modify_listing, remove_listing and purchase.
• [x] Solita generated SDK + manual helpers generated for devs to work with the contract and test it out.
• [ ] Bubblegum instruction Transfer split into two, one for transferring NFTs with the owner as signer, and one for transferring NFTs with delegate as signer. This should allow easier composability with other anchor programs (i.e. Marketplace contracts).

[samwise2]

Updates since last review @jarry-xiao :

• using safe math now
• purchase takes one less account and funds are paid directly to the marketplace singleton PDA
• withdraw function for an "authority" to withdraw fees from the marketplace PDA to any external key
• update properties function to update the props of the marketplace moving forward
• bubblegum::Transfer unchanged, and CPI hacked. I tried to keep as much Anchor stuff as possible but didn't see a way to nicely pull out a mutable Instruction that could be passed to invoke_signed. Tried to instantiate each field of invoke_signed with slightly modified Anchor stuff tho
• changed tests to work w tree depth 22 and buffer size 2048, purchase seems to work without issues

[samwise2]

name ideas: sugarshack , sweet-touth

[samwise2]

merging via offline approval from @jarry-xiao 🎉