feat: add metadata field for tokens

[RickyLB]

Signed-off-by: Ricky Saechao ricky@launchbadge.com

Description:

Nfts and fungible tokens can be updated with new fields, metadata and metadata_key. The new field metadata stores Token metadata at the token-level. metadata_key will be used to verify user to mutate the metadata.

This PR also solves backward compatibility issues with hedera-services v0.48.0.

Related issue(s):

• https://github.com/hashgraph/hedera-sdk-swift/issues/166
• https://github.com/hashgraph/hedera-sdk-swift/issues/168
• https://github.com/hashgraph/hedera-sdk-swift/issues/330
• https://github.com/hashgraph/hedera-sdk-swift/issues/332

Fixes #

Notes for reviewer:

Checklist

• [ ] Documented (Code comments, README, etc.)
• [ ] Tested (unit, integration, etc.)

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