HIP-646/657/765: Token metadata

[steven-sheehy]

Problem

HIP 647 Fungible Token Metadata, HIP-657 Mutable NFT Metadata, and HIP-765 NFT Collection Token Metadata Field are scheduled to be delivered in HAPI v0.48.0 as a single unit since they're all related. Mirror node needs to design and implement support for them.

Building on HIP-17 Non-Fungible Tokens, which, among other things, introduced the immutable metadata field for unique NFTs, the three new HIPs allow for metadata to be associated with both FTs and NFT collections (token class), as well as makes all metadata mutable by the introduction of the metadata key.

See also services epic issue and protobuf changes PR.

Solution

• Research the HIPs and how they impact mirror node
• Update the HIPs to add any REST API changes
• Create sub-tasks

Alternatives

No response

### Tasks
- [ ] https://github.com/hashgraph/hedera-mirror-node/issues/6548
- [ ] https://github.com/hashgraph/hedera-mirror-node/issues/6549
- [ ] https://github.com/hashgraph/hedera-mirror-node/issues/6551
- [ ] https://github.com/hashgraph/hedera-mirror-node/issues/7765
- [ ] https://github.com/hashgraph/hedera-mirror-node/issues/8075