feat(HIP-657): Mutable metadata fields for dynamic NFTs

[thenswan]

Description: This PR implements HIP-657.

Side-effects of this PR:

• protobuf update;
• TokenCreateTransaction unit tests were improved;
• added pauseKey to some integration tests (some integration tests are running with all keys, except of this one, but better to address it more deeply in other issise)

Related issue(s): Fixes https://github.com/hashgraph/hedera-sdk-java/issues/1496

Checklist

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

[sonarqubecloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[sonarqubecloud[bot]]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
88.7% Coverage on New Code
2.3% Duplication on New Code

See analysis details on SonarCloud