Co-authored-by: Bowen Wang <bowenwang1996@users.noreply.github.com>

… NEAR values

* nft-simple: add metadata for token and contract, for init and minting fns, and nft_metadata fn

* update nft_simple WASM file

…er (#135)

* update add callback to approvals with NonFungibleTokenApprovalsReceiver

* allow passing of deposit > 1 yocto when approve account id

* remove revoke_all callback and fix args

* finalized on_approve/revoke callbacks

* standards updates, enforce approval_id nonce, update nameing, remove revoke_approval callback

* fire approval callback no matter what

* clean up interface and deposit issues

* no bump approval on internal_transfer

* review edits OMG

* nft_approve: if account is already approver, don't check for attached deposit, refund if given

* add optional promise to nft_approve, fix approval id per entry via HashMap, add TokenReturnObject

* correct u64s that need to be U64

* nft-simple: add 6 basic unit tests

* review edits: remove return val on nft_approve, update sizing for hashmap

* remove as_return

* simplify Token struct, use U64, remove unnecessary helpers

* nft-simple: add exquisite corpse and simulation tests, ft wasm

* nft-simple: add to simulation tests w/ exquisite corpse to demonstrate nft_approve

* Rework NFT simple contract

* use near-sdk 3.1.0, simplify sim tests to use basic test-nft contract

Co-authored-by: Mike Purvis <mikedotexe@gmail.com>
Co-authored-by: Evgeny Kuzyakov <ek@nearprotocol.com>