feat: revamping a.k.a v2

[scott-dn]

Why?

v2

How?

1. Apply rust safe practice https://mmapped.blog/posts/01-effective-rust-canisters.html
2. Follow https://eips.ethereum.org/EIPS/eip-721#simple-summary
3. Deprecate dip721 suffix
4. Full integration test
5. Tooling: auto candid, linter ...

Tickets?

• N/A

Contribution checklist?

• [x] The commit messages are detailed
• [x] It does not break existing features (unless required)
• [x] I have performed a self-review of my own code
• [x] Documentation has been updated to reflect the changes
• [x] Tests have been added or updated to reflect the changes
• [x] All code formatting pass
• [x] All lints pass
• [x] All tests pass

Security checklist?

• [x] Injection has been prevented (parameterized queries, no eval or system calls)
• [x] Sensitive data has been identified and is being protected properly

Demo?

$ cd nft-v2

# generate candid
$ make candid

# build wasm
$ make build

# deploy local replica
$ make local

# integration test
$ make test