Add HIP-646: Fungible Token Metadata Field

[SimiHunjan]

Problem

HIP-646 introduces new Hedera protobuf changes where the a token metadata field is added to the TokenCreateTransaction and TokenUpdateTransaction. This metadata field will also be returned in the TokenInfoQuery.

HIP

• [x] https://hips.hedera.com/hip/hip-646

Hedera Protobuf

• [ ] (link Hedera protobuf PR when available)

Hedera Services Release

• 0.42

Summary of API changes

• [ ] Add metadata field to TokenCreateTransaction
• [ ] Add metadata field to TokenUpdateTransaction
• [ ] Return the metadata of a token from the TokenInfoQuery

Solution

• [ ] Design the feature
  • [ ] Add to the SDK references repository
• [ ] Implement design
• [ ] Add example

Alternatives

No response